Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/typing_extensions.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import abc |
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2 import collections |
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3 import contextlib |
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4 import sys |
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5 import typing |
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6 import collections.abc as collections_abc |
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7 import operator |
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8 |
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9 # These are used by Protocol implementation |
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10 # We use internal typing helpers here, but this significantly reduces |
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11 # code duplication. (Also this is only until Protocol is in typing.) |
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12 from typing import Generic, Callable, TypeVar, Tuple |
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13 |
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14 # After PEP 560, internal typing API was substantially reworked. |
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15 # This is especially important for Protocol class which uses internal APIs |
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16 # quite extensivelly. |
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17 PEP_560 = sys.version_info[:3] >= (3, 7, 0) |
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18 |
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19 if PEP_560: |
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20 GenericMeta = TypingMeta = type |
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21 else: |
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22 from typing import GenericMeta, TypingMeta |
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23 OLD_GENERICS = False |
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24 try: |
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25 from typing import _type_vars, _next_in_mro, _type_check |
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26 except ImportError: |
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27 OLD_GENERICS = True |
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28 try: |
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29 from typing import _subs_tree # noqa |
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30 SUBS_TREE = True |
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31 except ImportError: |
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32 SUBS_TREE = False |
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33 try: |
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34 from typing import _tp_cache |
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35 except ImportError: |
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36 def _tp_cache(x): |
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37 return x |
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38 try: |
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39 from typing import _TypingEllipsis, _TypingEmpty |
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40 except ImportError: |
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41 class _TypingEllipsis: |
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42 pass |
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43 |
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44 class _TypingEmpty: |
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45 pass |
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46 |
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47 |
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48 # The two functions below are copies of typing internal helpers. |
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49 # They are needed by _ProtocolMeta |
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50 |
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51 |
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52 def _no_slots_copy(dct): |
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53 dict_copy = dict(dct) |
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54 if '__slots__' in dict_copy: |
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55 for slot in dict_copy['__slots__']: |
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56 dict_copy.pop(slot, None) |
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57 return dict_copy |
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58 |
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59 |
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60 def _check_generic(cls, parameters): |
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61 if not cls.__parameters__: |
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62 raise TypeError("%s is not a generic class" % repr(cls)) |
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63 alen = len(parameters) |
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64 elen = len(cls.__parameters__) |
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65 if alen != elen: |
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66 raise TypeError("Too %s parameters for %s; actual %s, expected %s" % |
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67 ("many" if alen > elen else "few", repr(cls), alen, elen)) |
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68 |
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69 |
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70 if hasattr(typing, '_generic_new'): |
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71 _generic_new = typing._generic_new |
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72 else: |
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73 # Note: The '_generic_new(...)' function is used as a part of the |
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74 # process of creating a generic type and was added to the typing module |
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75 # as of Python 3.5.3. |
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76 # |
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77 # We've defined '_generic_new(...)' below to exactly match the behavior |
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78 # implemented in older versions of 'typing' bundled with Python 3.5.0 to |
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79 # 3.5.2. This helps eliminate redundancy when defining collection types |
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80 # like 'Deque' later. |
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81 # |
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82 # See https://github.com/python/typing/pull/308 for more details -- in |
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83 # particular, compare and contrast the definition of types like |
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84 # 'typing.List' before and after the merge. |
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85 |
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86 def _generic_new(base_cls, cls, *args, **kwargs): |
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87 return base_cls.__new__(cls, *args, **kwargs) |
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88 |
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89 # See https://github.com/python/typing/pull/439 |
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90 if hasattr(typing, '_geqv'): |
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91 from typing import _geqv |
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92 _geqv_defined = True |
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93 else: |
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94 _geqv = None |
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95 _geqv_defined = False |
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96 |
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97 if sys.version_info[:2] >= (3, 6): |
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98 import _collections_abc |
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99 _check_methods_in_mro = _collections_abc._check_methods |
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100 else: |
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101 def _check_methods_in_mro(C, *methods): |
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102 mro = C.__mro__ |
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103 for method in methods: |
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104 for B in mro: |
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105 if method in B.__dict__: |
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106 if B.__dict__[method] is None: |
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107 return NotImplemented |
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108 break |
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109 else: |
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110 return NotImplemented |
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111 return True |
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112 |
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113 |
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114 # Please keep __all__ alphabetized within each category. |
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115 __all__ = [ |
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116 # Super-special typing primitives. |
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117 'ClassVar', |
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118 'Final', |
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119 'Type', |
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120 |
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121 # ABCs (from collections.abc). |
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122 # The following are added depending on presence |
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123 # of their non-generic counterparts in stdlib: |
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124 # 'Awaitable', |
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125 # 'AsyncIterator', |
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126 # 'AsyncIterable', |
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127 # 'Coroutine', |
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128 # 'AsyncGenerator', |
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129 # 'AsyncContextManager', |
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130 # 'ChainMap', |
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131 |
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132 # Concrete collection types. |
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133 'ContextManager', |
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134 'Counter', |
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135 'Deque', |
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136 'DefaultDict', |
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137 'TypedDict', |
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138 |
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139 # Structural checks, a.k.a. protocols. |
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140 'SupportsIndex', |
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141 |
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142 # One-off things. |
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143 'final', |
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144 'IntVar', |
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145 'Literal', |
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146 'NewType', |
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147 'overload', |
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148 'Text', |
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149 'TYPE_CHECKING', |
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150 ] |
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151 |
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152 # Annotated relies on substitution trees of pep 560. It will not work for |
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153 # versions of typing older than 3.5.3 |
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154 HAVE_ANNOTATED = PEP_560 or SUBS_TREE |
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155 |
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156 if PEP_560: |
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157 __all__.extend(["get_args", "get_origin", "get_type_hints"]) |
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158 |
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159 if HAVE_ANNOTATED: |
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160 __all__.append("Annotated") |
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161 |
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162 # Protocols are hard to backport to the original version of typing 3.5.0 |
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163 HAVE_PROTOCOLS = sys.version_info[:3] != (3, 5, 0) |
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164 |
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165 if HAVE_PROTOCOLS: |
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166 __all__.extend(['Protocol', 'runtime', 'runtime_checkable']) |
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167 |
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168 |
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169 # TODO |
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170 if hasattr(typing, 'NoReturn'): |
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171 NoReturn = typing.NoReturn |
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172 elif hasattr(typing, '_FinalTypingBase'): |
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173 class _NoReturn(typing._FinalTypingBase, _root=True): |
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174 """Special type indicating functions that never return. |
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175 Example:: |
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176 |
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177 from typing import NoReturn |
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178 |
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179 def stop() -> NoReturn: |
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180 raise Exception('no way') |
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181 |
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182 This type is invalid in other positions, e.g., ``List[NoReturn]`` |
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183 will fail in static type checkers. |
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184 """ |
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185 __slots__ = () |
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186 |
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187 def __instancecheck__(self, obj): |
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188 raise TypeError("NoReturn cannot be used with isinstance().") |
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189 |
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190 def __subclasscheck__(self, cls): |
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191 raise TypeError("NoReturn cannot be used with issubclass().") |
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192 |
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193 NoReturn = _NoReturn(_root=True) |
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194 else: |
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195 class _NoReturnMeta(typing.TypingMeta): |
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196 """Metaclass for NoReturn""" |
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197 def __new__(cls, name, bases, namespace, _root=False): |
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198 return super().__new__(cls, name, bases, namespace, _root=_root) |
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199 |
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200 def __instancecheck__(self, obj): |
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201 raise TypeError("NoReturn cannot be used with isinstance().") |
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202 |
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203 def __subclasscheck__(self, cls): |
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204 raise TypeError("NoReturn cannot be used with issubclass().") |
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205 |
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206 class NoReturn(typing.Final, metaclass=_NoReturnMeta, _root=True): |
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207 """Special type indicating functions that never return. |
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208 Example:: |
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209 |
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210 from typing import NoReturn |
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211 |
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212 def stop() -> NoReturn: |
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213 raise Exception('no way') |
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214 |
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215 This type is invalid in other positions, e.g., ``List[NoReturn]`` |
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216 will fail in static type checkers. |
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217 """ |
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218 __slots__ = () |
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219 |
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220 |
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221 # Some unconstrained type variables. These are used by the container types. |
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222 # (These are not for export.) |
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223 T = typing.TypeVar('T') # Any type. |
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224 KT = typing.TypeVar('KT') # Key type. |
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225 VT = typing.TypeVar('VT') # Value type. |
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226 T_co = typing.TypeVar('T_co', covariant=True) # Any type covariant containers. |
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227 V_co = typing.TypeVar('V_co', covariant=True) # Any type covariant containers. |
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228 VT_co = typing.TypeVar('VT_co', covariant=True) # Value type covariant containers. |
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229 T_contra = typing.TypeVar('T_contra', contravariant=True) # Ditto contravariant. |
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230 |
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231 |
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232 if hasattr(typing, 'ClassVar'): |
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233 ClassVar = typing.ClassVar |
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234 elif hasattr(typing, '_FinalTypingBase'): |
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235 class _ClassVar(typing._FinalTypingBase, _root=True): |
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236 """Special type construct to mark class variables. |
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237 |
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238 An annotation wrapped in ClassVar indicates that a given |
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239 attribute is intended to be used as a class variable and |
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240 should not be set on instances of that class. Usage:: |
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241 |
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242 class Starship: |
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243 stats: ClassVar[Dict[str, int]] = {} # class variable |
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244 damage: int = 10 # instance variable |
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245 |
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246 ClassVar accepts only types and cannot be further subscribed. |
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247 |
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248 Note that ClassVar is not a class itself, and should not |
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249 be used with isinstance() or issubclass(). |
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250 """ |
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251 |
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252 __slots__ = ('__type__',) |
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253 |
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254 def __init__(self, tp=None, **kwds): |
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255 self.__type__ = tp |
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256 |
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257 def __getitem__(self, item): |
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258 cls = type(self) |
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259 if self.__type__ is None: |
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260 return cls(typing._type_check(item, |
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261 '{} accepts only single type.'.format(cls.__name__[1:])), |
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262 _root=True) |
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263 raise TypeError('{} cannot be further subscripted' |
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264 .format(cls.__name__[1:])) |
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265 |
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266 def _eval_type(self, globalns, localns): |
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267 new_tp = typing._eval_type(self.__type__, globalns, localns) |
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268 if new_tp == self.__type__: |
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269 return self |
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270 return type(self)(new_tp, _root=True) |
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271 |
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272 def __repr__(self): |
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273 r = super().__repr__() |
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274 if self.__type__ is not None: |
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275 r += '[{}]'.format(typing._type_repr(self.__type__)) |
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276 return r |
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277 |
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278 def __hash__(self): |
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279 return hash((type(self).__name__, self.__type__)) |
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280 |
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281 def __eq__(self, other): |
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282 if not isinstance(other, _ClassVar): |
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283 return NotImplemented |
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284 if self.__type__ is not None: |
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285 return self.__type__ == other.__type__ |
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286 return self is other |
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287 |
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288 ClassVar = _ClassVar(_root=True) |
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289 else: |
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290 class _ClassVarMeta(typing.TypingMeta): |
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291 """Metaclass for ClassVar""" |
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292 |
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293 def __new__(cls, name, bases, namespace, tp=None, _root=False): |
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294 self = super().__new__(cls, name, bases, namespace, _root=_root) |
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295 if tp is not None: |
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296 self.__type__ = tp |
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297 return self |
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298 |
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299 def __instancecheck__(self, obj): |
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300 raise TypeError("ClassVar cannot be used with isinstance().") |
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301 |
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302 def __subclasscheck__(self, cls): |
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303 raise TypeError("ClassVar cannot be used with issubclass().") |
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304 |
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305 def __getitem__(self, item): |
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306 cls = type(self) |
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307 if self.__type__ is not None: |
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308 raise TypeError('{} cannot be further subscripted' |
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309 .format(cls.__name__[1:])) |
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310 |
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311 param = typing._type_check( |
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312 item, |
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313 '{} accepts only single type.'.format(cls.__name__[1:])) |
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314 return cls(self.__name__, self.__bases__, |
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315 dict(self.__dict__), tp=param, _root=True) |
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316 |
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317 def _eval_type(self, globalns, localns): |
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318 new_tp = typing._eval_type(self.__type__, globalns, localns) |
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319 if new_tp == self.__type__: |
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320 return self |
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321 return type(self)(self.__name__, self.__bases__, |
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322 dict(self.__dict__), tp=self.__type__, |
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323 _root=True) |
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324 |
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325 def __repr__(self): |
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326 r = super().__repr__() |
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327 if self.__type__ is not None: |
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328 r += '[{}]'.format(typing._type_repr(self.__type__)) |
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329 return r |
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330 |
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331 def __hash__(self): |
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332 return hash((type(self).__name__, self.__type__)) |
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333 |
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334 def __eq__(self, other): |
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335 if not isinstance(other, ClassVar): |
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336 return NotImplemented |
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337 if self.__type__ is not None: |
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338 return self.__type__ == other.__type__ |
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339 return self is other |
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340 |
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341 class ClassVar(typing.Final, metaclass=_ClassVarMeta, _root=True): |
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342 """Special type construct to mark class variables. |
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343 |
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344 An annotation wrapped in ClassVar indicates that a given |
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345 attribute is intended to be used as a class variable and |
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346 should not be set on instances of that class. Usage:: |
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347 |
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348 class Starship: |
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349 stats: ClassVar[Dict[str, int]] = {} # class variable |
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350 damage: int = 10 # instance variable |
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351 |
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352 ClassVar accepts only types and cannot be further subscribed. |
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353 |
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354 Note that ClassVar is not a class itself, and should not |
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355 be used with isinstance() or issubclass(). |
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356 """ |
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357 |
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358 __type__ = None |
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359 |
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360 # On older versions of typing there is an internal class named "Final". |
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361 if hasattr(typing, 'Final') and sys.version_info[:2] >= (3, 7): |
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362 Final = typing.Final |
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363 elif sys.version_info[:2] >= (3, 7): |
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364 class _FinalForm(typing._SpecialForm, _root=True): |
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365 |
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366 def __repr__(self): |
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367 return 'typing_extensions.' + self._name |
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368 |
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369 def __getitem__(self, parameters): |
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370 item = typing._type_check(parameters, |
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371 '{} accepts only single type'.format(self._name)) |
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372 return _GenericAlias(self, (item,)) |
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373 |
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374 Final = _FinalForm('Final', |
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375 doc="""A special typing construct to indicate that a name |
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376 cannot be re-assigned or overridden in a subclass. |
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377 For example: |
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378 |
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379 MAX_SIZE: Final = 9000 |
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380 MAX_SIZE += 1 # Error reported by type checker |
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381 |
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382 class Connection: |
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383 TIMEOUT: Final[int] = 10 |
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384 class FastConnector(Connection): |
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385 TIMEOUT = 1 # Error reported by type checker |
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386 |
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387 There is no runtime checking of these properties.""") |
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388 elif hasattr(typing, '_FinalTypingBase'): |
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389 class _Final(typing._FinalTypingBase, _root=True): |
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390 """A special typing construct to indicate that a name |
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391 cannot be re-assigned or overridden in a subclass. |
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392 For example: |
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393 |
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394 MAX_SIZE: Final = 9000 |
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395 MAX_SIZE += 1 # Error reported by type checker |
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396 |
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397 class Connection: |
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398 TIMEOUT: Final[int] = 10 |
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399 class FastConnector(Connection): |
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400 TIMEOUT = 1 # Error reported by type checker |
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401 |
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402 There is no runtime checking of these properties. |
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403 """ |
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404 |
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405 __slots__ = ('__type__',) |
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406 |
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407 def __init__(self, tp=None, **kwds): |
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408 self.__type__ = tp |
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409 |
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410 def __getitem__(self, item): |
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411 cls = type(self) |
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412 if self.__type__ is None: |
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413 return cls(typing._type_check(item, |
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414 '{} accepts only single type.'.format(cls.__name__[1:])), |
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415 _root=True) |
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416 raise TypeError('{} cannot be further subscripted' |
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417 .format(cls.__name__[1:])) |
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418 |
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419 def _eval_type(self, globalns, localns): |
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420 new_tp = typing._eval_type(self.__type__, globalns, localns) |
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421 if new_tp == self.__type__: |
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422 return self |
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423 return type(self)(new_tp, _root=True) |
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424 |
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425 def __repr__(self): |
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426 r = super().__repr__() |
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427 if self.__type__ is not None: |
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428 r += '[{}]'.format(typing._type_repr(self.__type__)) |
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429 return r |
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430 |
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431 def __hash__(self): |
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432 return hash((type(self).__name__, self.__type__)) |
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433 |
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434 def __eq__(self, other): |
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435 if not isinstance(other, _Final): |
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436 return NotImplemented |
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437 if self.__type__ is not None: |
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438 return self.__type__ == other.__type__ |
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439 return self is other |
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440 |
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441 Final = _Final(_root=True) |
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442 else: |
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443 class _FinalMeta(typing.TypingMeta): |
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444 """Metaclass for Final""" |
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445 |
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446 def __new__(cls, name, bases, namespace, tp=None, _root=False): |
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447 self = super().__new__(cls, name, bases, namespace, _root=_root) |
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448 if tp is not None: |
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449 self.__type__ = tp |
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450 return self |
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451 |
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452 def __instancecheck__(self, obj): |
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453 raise TypeError("Final cannot be used with isinstance().") |
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454 |
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455 def __subclasscheck__(self, cls): |
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456 raise TypeError("Final cannot be used with issubclass().") |
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457 |
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458 def __getitem__(self, item): |
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459 cls = type(self) |
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460 if self.__type__ is not None: |
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461 raise TypeError('{} cannot be further subscripted' |
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462 .format(cls.__name__[1:])) |
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463 |
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464 param = typing._type_check( |
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465 item, |
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466 '{} accepts only single type.'.format(cls.__name__[1:])) |
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467 return cls(self.__name__, self.__bases__, |
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468 dict(self.__dict__), tp=param, _root=True) |
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469 |
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470 def _eval_type(self, globalns, localns): |
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471 new_tp = typing._eval_type(self.__type__, globalns, localns) |
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472 if new_tp == self.__type__: |
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473 return self |
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474 return type(self)(self.__name__, self.__bases__, |
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475 dict(self.__dict__), tp=self.__type__, |
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476 _root=True) |
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477 |
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478 def __repr__(self): |
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479 r = super().__repr__() |
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480 if self.__type__ is not None: |
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481 r += '[{}]'.format(typing._type_repr(self.__type__)) |
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482 return r |
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483 |
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484 def __hash__(self): |
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485 return hash((type(self).__name__, self.__type__)) |
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486 |
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487 def __eq__(self, other): |
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488 if not isinstance(other, Final): |
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489 return NotImplemented |
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490 if self.__type__ is not None: |
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491 return self.__type__ == other.__type__ |
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492 return self is other |
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493 |
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494 class Final(typing.Final, metaclass=_FinalMeta, _root=True): |
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495 """A special typing construct to indicate that a name |
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496 cannot be re-assigned or overridden in a subclass. |
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497 For example: |
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498 |
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499 MAX_SIZE: Final = 9000 |
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500 MAX_SIZE += 1 # Error reported by type checker |
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501 |
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502 class Connection: |
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503 TIMEOUT: Final[int] = 10 |
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504 class FastConnector(Connection): |
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505 TIMEOUT = 1 # Error reported by type checker |
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506 |
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507 There is no runtime checking of these properties. |
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508 """ |
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509 |
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510 __type__ = None |
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511 |
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512 |
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513 if hasattr(typing, 'final'): |
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514 final = typing.final |
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515 else: |
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516 def final(f): |
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517 """This decorator can be used to indicate to type checkers that |
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518 the decorated method cannot be overridden, and decorated class |
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519 cannot be subclassed. For example: |
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520 |
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521 class Base: |
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522 @final |
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523 def done(self) -> None: |
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524 ... |
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525 class Sub(Base): |
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526 def done(self) -> None: # Error reported by type checker |
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527 ... |
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528 @final |
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529 class Leaf: |
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530 ... |
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531 class Other(Leaf): # Error reported by type checker |
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532 ... |
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533 |
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534 There is no runtime checking of these properties. |
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535 """ |
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536 return f |
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537 |
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538 |
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539 def IntVar(name): |
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540 return TypeVar(name) |
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541 |
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542 |
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543 if hasattr(typing, 'Literal'): |
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544 Literal = typing.Literal |
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545 elif sys.version_info[:2] >= (3, 7): |
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546 class _LiteralForm(typing._SpecialForm, _root=True): |
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547 |
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548 def __repr__(self): |
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549 return 'typing_extensions.' + self._name |
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550 |
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551 def __getitem__(self, parameters): |
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552 return _GenericAlias(self, parameters) |
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553 |
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554 Literal = _LiteralForm('Literal', |
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555 doc="""A type that can be used to indicate to type checkers |
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556 that the corresponding value has a value literally equivalent |
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557 to the provided parameter. For example: |
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558 |
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559 var: Literal[4] = 4 |
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560 |
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561 The type checker understands that 'var' is literally equal to |
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562 the value 4 and no other value. |
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563 |
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564 Literal[...] cannot be subclassed. There is no runtime |
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565 checking verifying that the parameter is actually a value |
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566 instead of a type.""") |
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567 elif hasattr(typing, '_FinalTypingBase'): |
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568 class _Literal(typing._FinalTypingBase, _root=True): |
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569 """A type that can be used to indicate to type checkers that the |
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570 corresponding value has a value literally equivalent to the |
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571 provided parameter. For example: |
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572 |
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573 var: Literal[4] = 4 |
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574 |
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575 The type checker understands that 'var' is literally equal to the |
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576 value 4 and no other value. |
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577 |
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578 Literal[...] cannot be subclassed. There is no runtime checking |
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579 verifying that the parameter is actually a value instead of a type. |
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580 """ |
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581 |
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582 __slots__ = ('__values__',) |
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583 |
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584 def __init__(self, values=None, **kwds): |
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585 self.__values__ = values |
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586 |
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587 def __getitem__(self, values): |
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588 cls = type(self) |
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589 if self.__values__ is None: |
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590 if not isinstance(values, tuple): |
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591 values = (values,) |
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592 return cls(values, _root=True) |
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593 raise TypeError('{} cannot be further subscripted' |
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594 .format(cls.__name__[1:])) |
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595 |
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596 def _eval_type(self, globalns, localns): |
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597 return self |
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598 |
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599 def __repr__(self): |
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600 r = super().__repr__() |
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601 if self.__values__ is not None: |
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602 r += '[{}]'.format(', '.join(map(typing._type_repr, self.__values__))) |
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603 return r |
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604 |
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605 def __hash__(self): |
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606 return hash((type(self).__name__, self.__values__)) |
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607 |
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608 def __eq__(self, other): |
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609 if not isinstance(other, _Literal): |
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610 return NotImplemented |
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611 if self.__values__ is not None: |
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612 return self.__values__ == other.__values__ |
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613 return self is other |
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614 |
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615 Literal = _Literal(_root=True) |
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616 else: |
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617 class _LiteralMeta(typing.TypingMeta): |
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618 """Metaclass for Literal""" |
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619 |
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620 def __new__(cls, name, bases, namespace, values=None, _root=False): |
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621 self = super().__new__(cls, name, bases, namespace, _root=_root) |
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622 if values is not None: |
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623 self.__values__ = values |
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624 return self |
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625 |
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626 def __instancecheck__(self, obj): |
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627 raise TypeError("Literal cannot be used with isinstance().") |
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628 |
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629 def __subclasscheck__(self, cls): |
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630 raise TypeError("Literal cannot be used with issubclass().") |
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631 |
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632 def __getitem__(self, item): |
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633 cls = type(self) |
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634 if self.__values__ is not None: |
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635 raise TypeError('{} cannot be further subscripted' |
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636 .format(cls.__name__[1:])) |
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637 |
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638 if not isinstance(item, tuple): |
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639 item = (item,) |
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640 return cls(self.__name__, self.__bases__, |
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641 dict(self.__dict__), values=item, _root=True) |
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642 |
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643 def _eval_type(self, globalns, localns): |
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644 return self |
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645 |
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646 def __repr__(self): |
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647 r = super().__repr__() |
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648 if self.__values__ is not None: |
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649 r += '[{}]'.format(', '.join(map(typing._type_repr, self.__values__))) |
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650 return r |
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651 |
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652 def __hash__(self): |
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653 return hash((type(self).__name__, self.__values__)) |
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654 |
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655 def __eq__(self, other): |
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656 if not isinstance(other, Literal): |
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657 return NotImplemented |
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658 if self.__values__ is not None: |
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659 return self.__values__ == other.__values__ |
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660 return self is other |
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661 |
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662 class Literal(typing.Final, metaclass=_LiteralMeta, _root=True): |
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663 """A type that can be used to indicate to type checkers that the |
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664 corresponding value has a value literally equivalent to the |
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665 provided parameter. For example: |
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666 |
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667 var: Literal[4] = 4 |
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668 |
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669 The type checker understands that 'var' is literally equal to the |
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670 value 4 and no other value. |
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671 |
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672 Literal[...] cannot be subclassed. There is no runtime checking |
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673 verifying that the parameter is actually a value instead of a type. |
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674 """ |
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675 |
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676 __values__ = None |
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677 |
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678 |
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679 def _overload_dummy(*args, **kwds): |
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680 """Helper for @overload to raise when called.""" |
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681 raise NotImplementedError( |
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682 "You should not call an overloaded function. " |
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683 "A series of @overload-decorated functions " |
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684 "outside a stub module should always be followed " |
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685 "by an implementation that is not @overload-ed.") |
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686 |
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687 |
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688 def overload(func): |
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689 """Decorator for overloaded functions/methods. |
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690 |
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691 In a stub file, place two or more stub definitions for the same |
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692 function in a row, each decorated with @overload. For example: |
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693 |
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694 @overload |
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695 def utf8(value: None) -> None: ... |
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696 @overload |
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697 def utf8(value: bytes) -> bytes: ... |
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698 @overload |
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699 def utf8(value: str) -> bytes: ... |
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700 |
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701 In a non-stub file (i.e. a regular .py file), do the same but |
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702 follow it with an implementation. The implementation should *not* |
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703 be decorated with @overload. For example: |
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704 |
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705 @overload |
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706 def utf8(value: None) -> None: ... |
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707 @overload |
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708 def utf8(value: bytes) -> bytes: ... |
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709 @overload |
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710 def utf8(value: str) -> bytes: ... |
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711 def utf8(value): |
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712 # implementation goes here |
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713 """ |
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714 return _overload_dummy |
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715 |
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716 |
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717 # This is not a real generic class. Don't use outside annotations. |
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718 if hasattr(typing, 'Type'): |
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719 Type = typing.Type |
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720 else: |
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721 # Internal type variable used for Type[]. |
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722 CT_co = typing.TypeVar('CT_co', covariant=True, bound=type) |
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723 |
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724 class Type(typing.Generic[CT_co], extra=type): |
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725 """A special construct usable to annotate class objects. |
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726 |
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727 For example, suppose we have the following classes:: |
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728 |
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729 class User: ... # Abstract base for User classes |
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730 class BasicUser(User): ... |
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731 class ProUser(User): ... |
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732 class TeamUser(User): ... |
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733 |
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734 And a function that takes a class argument that's a subclass of |
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735 User and returns an instance of the corresponding class:: |
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736 |
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737 U = TypeVar('U', bound=User) |
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738 def new_user(user_class: Type[U]) -> U: |
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739 user = user_class() |
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740 # (Here we could write the user object to a database) |
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741 return user |
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742 joe = new_user(BasicUser) |
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743 |
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744 At this point the type checker knows that joe has type BasicUser. |
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745 """ |
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746 |
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747 __slots__ = () |
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748 |
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749 |
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750 # Various ABCs mimicking those in collections.abc. |
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751 # A few are simply re-exported for completeness. |
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752 |
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753 def _define_guard(type_name): |
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754 """ |
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755 Returns True if the given type isn't defined in typing but |
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756 is defined in collections_abc. |
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757 |
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758 Adds the type to __all__ if the collection is found in either |
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759 typing or collection_abc. |
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760 """ |
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761 if hasattr(typing, type_name): |
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762 __all__.append(type_name) |
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763 globals()[type_name] = getattr(typing, type_name) |
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764 return False |
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765 elif hasattr(collections_abc, type_name): |
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766 __all__.append(type_name) |
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767 return True |
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768 else: |
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769 return False |
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770 |
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771 |
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772 class _ExtensionsGenericMeta(GenericMeta): |
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773 def __subclasscheck__(self, subclass): |
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774 """This mimics a more modern GenericMeta.__subclasscheck__() logic |
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775 (that does not have problems with recursion) to work around interactions |
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776 between collections, typing, and typing_extensions on older |
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777 versions of Python, see https://github.com/python/typing/issues/501. |
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778 """ |
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779 if sys.version_info[:3] >= (3, 5, 3) or sys.version_info[:3] < (3, 5, 0): |
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780 if self.__origin__ is not None: |
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781 if sys._getframe(1).f_globals['__name__'] not in ['abc', 'functools']: |
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782 raise TypeError("Parameterized generics cannot be used with class " |
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783 "or instance checks") |
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784 return False |
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785 if not self.__extra__: |
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786 return super().__subclasscheck__(subclass) |
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787 res = self.__extra__.__subclasshook__(subclass) |
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788 if res is not NotImplemented: |
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789 return res |
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790 if self.__extra__ in subclass.__mro__: |
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791 return True |
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792 for scls in self.__extra__.__subclasses__(): |
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793 if isinstance(scls, GenericMeta): |
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794 continue |
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795 if issubclass(subclass, scls): |
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796 return True |
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797 return False |
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|
798 |
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|
799 |
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|
800 if _define_guard('Awaitable'): |
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|
801 class Awaitable(typing.Generic[T_co], metaclass=_ExtensionsGenericMeta, |
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|
802 extra=collections_abc.Awaitable): |
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|
803 __slots__ = () |
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|
804 |
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|
805 |
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|
806 if _define_guard('Coroutine'): |
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|
807 class Coroutine(Awaitable[V_co], typing.Generic[T_co, T_contra, V_co], |
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|
808 metaclass=_ExtensionsGenericMeta, |
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809 extra=collections_abc.Coroutine): |
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|
810 __slots__ = () |
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|
811 |
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812 |
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|
813 if _define_guard('AsyncIterable'): |
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814 class AsyncIterable(typing.Generic[T_co], |
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815 metaclass=_ExtensionsGenericMeta, |
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|
816 extra=collections_abc.AsyncIterable): |
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817 __slots__ = () |
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818 |
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|
819 |
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820 if _define_guard('AsyncIterator'): |
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821 class AsyncIterator(AsyncIterable[T_co], |
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822 metaclass=_ExtensionsGenericMeta, |
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823 extra=collections_abc.AsyncIterator): |
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824 __slots__ = () |
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825 |
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826 |
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827 if hasattr(typing, 'Deque'): |
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828 Deque = typing.Deque |
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829 elif _geqv_defined: |
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830 class Deque(collections.deque, typing.MutableSequence[T], |
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831 metaclass=_ExtensionsGenericMeta, |
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832 extra=collections.deque): |
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833 __slots__ = () |
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834 |
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835 def __new__(cls, *args, **kwds): |
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836 if _geqv(cls, Deque): |
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837 return collections.deque(*args, **kwds) |
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838 return _generic_new(collections.deque, cls, *args, **kwds) |
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839 else: |
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840 class Deque(collections.deque, typing.MutableSequence[T], |
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841 metaclass=_ExtensionsGenericMeta, |
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842 extra=collections.deque): |
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843 __slots__ = () |
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844 |
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845 def __new__(cls, *args, **kwds): |
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846 if cls._gorg is Deque: |
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847 return collections.deque(*args, **kwds) |
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848 return _generic_new(collections.deque, cls, *args, **kwds) |
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849 |
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850 |
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851 if hasattr(typing, 'ContextManager'): |
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852 ContextManager = typing.ContextManager |
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853 elif hasattr(contextlib, 'AbstractContextManager'): |
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854 class ContextManager(typing.Generic[T_co], |
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855 metaclass=_ExtensionsGenericMeta, |
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856 extra=contextlib.AbstractContextManager): |
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857 __slots__ = () |
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858 else: |
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859 class ContextManager(typing.Generic[T_co]): |
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860 __slots__ = () |
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861 |
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862 def __enter__(self): |
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863 return self |
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864 |
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865 @abc.abstractmethod |
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866 def __exit__(self, exc_type, exc_value, traceback): |
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867 return None |
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868 |
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869 @classmethod |
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870 def __subclasshook__(cls, C): |
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871 if cls is ContextManager: |
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872 # In Python 3.6+, it is possible to set a method to None to |
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873 # explicitly indicate that the class does not implement an ABC |
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874 # (https://bugs.python.org/issue25958), but we do not support |
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875 # that pattern here because this fallback class is only used |
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876 # in Python 3.5 and earlier. |
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877 if (any("__enter__" in B.__dict__ for B in C.__mro__) and |
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878 any("__exit__" in B.__dict__ for B in C.__mro__)): |
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879 return True |
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880 return NotImplemented |
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881 |
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882 |
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883 if hasattr(typing, 'AsyncContextManager'): |
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884 AsyncContextManager = typing.AsyncContextManager |
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885 __all__.append('AsyncContextManager') |
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886 elif hasattr(contextlib, 'AbstractAsyncContextManager'): |
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887 class AsyncContextManager(typing.Generic[T_co], |
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888 metaclass=_ExtensionsGenericMeta, |
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889 extra=contextlib.AbstractAsyncContextManager): |
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890 __slots__ = () |
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891 |
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892 __all__.append('AsyncContextManager') |
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893 elif sys.version_info[:2] >= (3, 5): |
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894 exec(""" |
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895 class AsyncContextManager(typing.Generic[T_co]): |
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896 __slots__ = () |
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|
897 |
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|
898 async def __aenter__(self): |
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899 return self |
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|
900 |
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901 @abc.abstractmethod |
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902 async def __aexit__(self, exc_type, exc_value, traceback): |
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|
903 return None |
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|
904 |
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905 @classmethod |
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906 def __subclasshook__(cls, C): |
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907 if cls is AsyncContextManager: |
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908 return _check_methods_in_mro(C, "__aenter__", "__aexit__") |
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909 return NotImplemented |
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|
910 |
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|
911 __all__.append('AsyncContextManager') |
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|
912 """) |
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913 |
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914 |
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|
915 if hasattr(typing, 'DefaultDict'): |
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|
916 DefaultDict = typing.DefaultDict |
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917 elif _geqv_defined: |
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918 class DefaultDict(collections.defaultdict, typing.MutableMapping[KT, VT], |
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|
919 metaclass=_ExtensionsGenericMeta, |
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920 extra=collections.defaultdict): |
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921 |
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|
922 __slots__ = () |
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923 |
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924 def __new__(cls, *args, **kwds): |
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925 if _geqv(cls, DefaultDict): |
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926 return collections.defaultdict(*args, **kwds) |
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927 return _generic_new(collections.defaultdict, cls, *args, **kwds) |
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|
928 else: |
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929 class DefaultDict(collections.defaultdict, typing.MutableMapping[KT, VT], |
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930 metaclass=_ExtensionsGenericMeta, |
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931 extra=collections.defaultdict): |
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932 |
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933 __slots__ = () |
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934 |
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935 def __new__(cls, *args, **kwds): |
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936 if cls._gorg is DefaultDict: |
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937 return collections.defaultdict(*args, **kwds) |
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938 return _generic_new(collections.defaultdict, cls, *args, **kwds) |
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939 |
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940 |
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941 if hasattr(typing, 'Counter'): |
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942 Counter = typing.Counter |
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943 elif (3, 5, 0) <= sys.version_info[:3] <= (3, 5, 1): |
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944 assert _geqv_defined |
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945 _TInt = typing.TypeVar('_TInt') |
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946 |
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947 class _CounterMeta(typing.GenericMeta): |
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948 """Metaclass for Counter""" |
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949 def __getitem__(self, item): |
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950 return super().__getitem__((item, int)) |
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951 |
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952 class Counter(collections.Counter, |
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953 typing.Dict[T, int], |
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954 metaclass=_CounterMeta, |
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955 extra=collections.Counter): |
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956 |
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957 __slots__ = () |
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958 |
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959 def __new__(cls, *args, **kwds): |
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960 if _geqv(cls, Counter): |
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961 return collections.Counter(*args, **kwds) |
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962 return _generic_new(collections.Counter, cls, *args, **kwds) |
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963 |
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964 elif _geqv_defined: |
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965 class Counter(collections.Counter, |
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966 typing.Dict[T, int], |
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967 metaclass=_ExtensionsGenericMeta, extra=collections.Counter): |
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968 |
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969 __slots__ = () |
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970 |
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971 def __new__(cls, *args, **kwds): |
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972 if _geqv(cls, Counter): |
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973 return collections.Counter(*args, **kwds) |
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974 return _generic_new(collections.Counter, cls, *args, **kwds) |
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975 |
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976 else: |
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977 class Counter(collections.Counter, |
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978 typing.Dict[T, int], |
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979 metaclass=_ExtensionsGenericMeta, extra=collections.Counter): |
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980 |
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981 __slots__ = () |
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982 |
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983 def __new__(cls, *args, **kwds): |
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984 if cls._gorg is Counter: |
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985 return collections.Counter(*args, **kwds) |
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986 return _generic_new(collections.Counter, cls, *args, **kwds) |
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987 |
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988 |
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989 if hasattr(typing, 'ChainMap'): |
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990 ChainMap = typing.ChainMap |
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991 __all__.append('ChainMap') |
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992 elif hasattr(collections, 'ChainMap'): |
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993 # ChainMap only exists in 3.3+ |
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994 if _geqv_defined: |
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995 class ChainMap(collections.ChainMap, typing.MutableMapping[KT, VT], |
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996 metaclass=_ExtensionsGenericMeta, |
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997 extra=collections.ChainMap): |
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998 |
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999 __slots__ = () |
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1000 |
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1001 def __new__(cls, *args, **kwds): |
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1002 if _geqv(cls, ChainMap): |
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1003 return collections.ChainMap(*args, **kwds) |
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1004 return _generic_new(collections.ChainMap, cls, *args, **kwds) |
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1005 else: |
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1006 class ChainMap(collections.ChainMap, typing.MutableMapping[KT, VT], |
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1007 metaclass=_ExtensionsGenericMeta, |
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1008 extra=collections.ChainMap): |
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1009 |
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1010 __slots__ = () |
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1011 |
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1012 def __new__(cls, *args, **kwds): |
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1013 if cls._gorg is ChainMap: |
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1014 return collections.ChainMap(*args, **kwds) |
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1015 return _generic_new(collections.ChainMap, cls, *args, **kwds) |
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1016 |
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1017 __all__.append('ChainMap') |
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1018 |
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1019 |
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1020 if _define_guard('AsyncGenerator'): |
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1021 class AsyncGenerator(AsyncIterator[T_co], typing.Generic[T_co, T_contra], |
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1022 metaclass=_ExtensionsGenericMeta, |
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1023 extra=collections_abc.AsyncGenerator): |
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1024 __slots__ = () |
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1025 |
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1026 |
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1027 if hasattr(typing, 'NewType'): |
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1028 NewType = typing.NewType |
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1029 else: |
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1030 def NewType(name, tp): |
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1031 """NewType creates simple unique types with almost zero |
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1032 runtime overhead. NewType(name, tp) is considered a subtype of tp |
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1033 by static type checkers. At runtime, NewType(name, tp) returns |
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1034 a dummy function that simply returns its argument. Usage:: |
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1035 |
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1036 UserId = NewType('UserId', int) |
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1037 |
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1038 def name_by_id(user_id: UserId) -> str: |
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1039 ... |
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1040 |
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1041 UserId('user') # Fails type check |
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1042 |
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1043 name_by_id(42) # Fails type check |
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1044 name_by_id(UserId(42)) # OK |
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1045 |
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1046 num = UserId(5) + 1 # type: int |
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1047 """ |
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1048 |
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1049 def new_type(x): |
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1050 return x |
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1051 |
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1052 new_type.__name__ = name |
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1053 new_type.__supertype__ = tp |
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1054 return new_type |
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1055 |
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1056 |
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1057 if hasattr(typing, 'Text'): |
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1058 Text = typing.Text |
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1059 else: |
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1060 Text = str |
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1061 |
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1062 |
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1063 if hasattr(typing, 'TYPE_CHECKING'): |
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1064 TYPE_CHECKING = typing.TYPE_CHECKING |
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1065 else: |
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1066 # Constant that's True when type checking, but False here. |
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1067 TYPE_CHECKING = False |
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1068 |
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1069 |
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1070 def _gorg(cls): |
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1071 """This function exists for compatibility with old typing versions.""" |
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1072 assert isinstance(cls, GenericMeta) |
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1073 if hasattr(cls, '_gorg'): |
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1074 return cls._gorg |
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1075 while cls.__origin__ is not None: |
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1076 cls = cls.__origin__ |
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1077 return cls |
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1078 |
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1079 |
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1080 if OLD_GENERICS: |
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1081 def _next_in_mro(cls): # noqa |
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1082 """This function exists for compatibility with old typing versions.""" |
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1083 next_in_mro = object |
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1084 for i, c in enumerate(cls.__mro__[:-1]): |
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1085 if isinstance(c, GenericMeta) and _gorg(c) is Generic: |
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1086 next_in_mro = cls.__mro__[i + 1] |
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1087 return next_in_mro |
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1088 |
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1089 |
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1090 _PROTO_WHITELIST = ['Callable', 'Awaitable', |
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1091 'Iterable', 'Iterator', 'AsyncIterable', 'AsyncIterator', |
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1092 'Hashable', 'Sized', 'Container', 'Collection', 'Reversible', |
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1093 'ContextManager', 'AsyncContextManager'] |
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1094 |
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1095 |
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1096 def _get_protocol_attrs(cls): |
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1097 attrs = set() |
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1098 for base in cls.__mro__[:-1]: # without object |
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1099 if base.__name__ in ('Protocol', 'Generic'): |
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1100 continue |
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1101 annotations = getattr(base, '__annotations__', {}) |
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1102 for attr in list(base.__dict__.keys()) + list(annotations.keys()): |
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1103 if (not attr.startswith('_abc_') and attr not in ( |
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1104 '__abstractmethods__', '__annotations__', '__weakref__', |
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1105 '_is_protocol', '_is_runtime_protocol', '__dict__', |
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1106 '__args__', '__slots__', |
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1107 '__next_in_mro__', '__parameters__', '__origin__', |
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1108 '__orig_bases__', '__extra__', '__tree_hash__', |
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1109 '__doc__', '__subclasshook__', '__init__', '__new__', |
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1110 '__module__', '_MutableMapping__marker', '_gorg')): |
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1111 attrs.add(attr) |
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1112 return attrs |
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1113 |
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1114 |
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1115 def _is_callable_members_only(cls): |
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1116 return all(callable(getattr(cls, attr, None)) for attr in _get_protocol_attrs(cls)) |
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1117 |
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1118 |
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1119 if hasattr(typing, 'Protocol'): |
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1120 Protocol = typing.Protocol |
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1121 elif HAVE_PROTOCOLS and not PEP_560: |
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1122 class _ProtocolMeta(GenericMeta): |
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1123 """Internal metaclass for Protocol. |
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1124 |
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1125 This exists so Protocol classes can be generic without deriving |
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1126 from Generic. |
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1127 """ |
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1128 if not OLD_GENERICS: |
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1129 def __new__(cls, name, bases, namespace, |
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1130 tvars=None, args=None, origin=None, extra=None, orig_bases=None): |
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1131 # This is just a version copied from GenericMeta.__new__ that |
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1132 # includes "Protocol" special treatment. (Comments removed for brevity.) |
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1133 assert extra is None # Protocols should not have extra |
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1134 if tvars is not None: |
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1135 assert origin is not None |
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1136 assert all(isinstance(t, TypeVar) for t in tvars), tvars |
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1137 else: |
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1138 tvars = _type_vars(bases) |
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1139 gvars = None |
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1140 for base in bases: |
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1141 if base is Generic: |
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1142 raise TypeError("Cannot inherit from plain Generic") |
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1143 if (isinstance(base, GenericMeta) and |
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1144 base.__origin__ in (Generic, Protocol)): |
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1145 if gvars is not None: |
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1146 raise TypeError( |
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1147 "Cannot inherit from Generic[...] or" |
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1148 " Protocol[...] multiple times.") |
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1149 gvars = base.__parameters__ |
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1150 if gvars is None: |
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1151 gvars = tvars |
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1152 else: |
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1153 tvarset = set(tvars) |
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1154 gvarset = set(gvars) |
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1155 if not tvarset <= gvarset: |
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1156 raise TypeError( |
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1157 "Some type variables (%s) " |
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1158 "are not listed in %s[%s]" % |
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1159 (", ".join(str(t) for t in tvars if t not in gvarset), |
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1160 "Generic" if any(b.__origin__ is Generic |
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1161 for b in bases) else "Protocol", |
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1162 ", ".join(str(g) for g in gvars))) |
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1163 tvars = gvars |
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1164 |
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1165 initial_bases = bases |
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1166 if (extra is not None and type(extra) is abc.ABCMeta and |
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1167 extra not in bases): |
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1168 bases = (extra,) + bases |
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1169 bases = tuple(_gorg(b) if isinstance(b, GenericMeta) else b |
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1170 for b in bases) |
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1171 if any(isinstance(b, GenericMeta) and b is not Generic for b in bases): |
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1172 bases = tuple(b for b in bases if b is not Generic) |
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1173 namespace.update({'__origin__': origin, '__extra__': extra}) |
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1174 self = super(GenericMeta, cls).__new__(cls, name, bases, namespace, |
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1175 _root=True) |
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1176 super(GenericMeta, self).__setattr__('_gorg', |
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1177 self if not origin else |
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1178 _gorg(origin)) |
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1179 self.__parameters__ = tvars |
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1180 self.__args__ = tuple(... if a is _TypingEllipsis else |
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1181 () if a is _TypingEmpty else |
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1182 a for a in args) if args else None |
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1183 self.__next_in_mro__ = _next_in_mro(self) |
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1184 if orig_bases is None: |
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1185 self.__orig_bases__ = initial_bases |
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1186 elif origin is not None: |
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1187 self._abc_registry = origin._abc_registry |
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1188 self._abc_cache = origin._abc_cache |
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1189 if hasattr(self, '_subs_tree'): |
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1190 self.__tree_hash__ = (hash(self._subs_tree()) if origin else |
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1191 super(GenericMeta, self).__hash__()) |
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1192 return self |
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1193 |
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1194 def __init__(cls, *args, **kwargs): |
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1195 super().__init__(*args, **kwargs) |
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1196 if not cls.__dict__.get('_is_protocol', None): |
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1197 cls._is_protocol = any(b is Protocol or |
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1198 isinstance(b, _ProtocolMeta) and |
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1199 b.__origin__ is Protocol |
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1200 for b in cls.__bases__) |
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1201 if cls._is_protocol: |
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1202 for base in cls.__mro__[1:]: |
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1203 if not (base in (object, Generic) or |
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1204 base.__module__ == 'collections.abc' and |
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1205 base.__name__ in _PROTO_WHITELIST or |
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1206 isinstance(base, TypingMeta) and base._is_protocol or |
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1207 isinstance(base, GenericMeta) and |
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1208 base.__origin__ is Generic): |
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1209 raise TypeError('Protocols can only inherit from other' |
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1210 ' protocols, got %r' % base) |
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1211 |
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1212 def _no_init(self, *args, **kwargs): |
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1213 if type(self)._is_protocol: |
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1214 raise TypeError('Protocols cannot be instantiated') |
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1215 cls.__init__ = _no_init |
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1216 |
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1217 def _proto_hook(other): |
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1218 if not cls.__dict__.get('_is_protocol', None): |
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1219 return NotImplemented |
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1220 if not isinstance(other, type): |
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1221 # Same error as for issubclass(1, int) |
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1222 raise TypeError('issubclass() arg 1 must be a class') |
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1223 for attr in _get_protocol_attrs(cls): |
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1224 for base in other.__mro__: |
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1225 if attr in base.__dict__: |
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1226 if base.__dict__[attr] is None: |
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1227 return NotImplemented |
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1228 break |
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1229 annotations = getattr(base, '__annotations__', {}) |
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1230 if (isinstance(annotations, typing.Mapping) and |
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1231 attr in annotations and |
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1232 isinstance(other, _ProtocolMeta) and |
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1233 other._is_protocol): |
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1234 break |
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1235 else: |
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1236 return NotImplemented |
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1237 return True |
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1238 if '__subclasshook__' not in cls.__dict__: |
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1239 cls.__subclasshook__ = _proto_hook |
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1240 |
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1241 def __instancecheck__(self, instance): |
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1242 # We need this method for situations where attributes are |
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1243 # assigned in __init__. |
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1244 if ((not getattr(self, '_is_protocol', False) or |
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1245 _is_callable_members_only(self)) and |
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1246 issubclass(instance.__class__, self)): |
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1247 return True |
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1248 if self._is_protocol: |
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1249 if all(hasattr(instance, attr) and |
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1250 (not callable(getattr(self, attr, None)) or |
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1251 getattr(instance, attr) is not None) |
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1252 for attr in _get_protocol_attrs(self)): |
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1253 return True |
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1254 return super(GenericMeta, self).__instancecheck__(instance) |
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1255 |
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1256 def __subclasscheck__(self, cls): |
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1257 if self.__origin__ is not None: |
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1258 if sys._getframe(1).f_globals['__name__'] not in ['abc', 'functools']: |
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1259 raise TypeError("Parameterized generics cannot be used with class " |
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1260 "or instance checks") |
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1261 return False |
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1262 if (self.__dict__.get('_is_protocol', None) and |
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1263 not self.__dict__.get('_is_runtime_protocol', None)): |
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1264 if sys._getframe(1).f_globals['__name__'] in ['abc', |
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1265 'functools', |
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1266 'typing']: |
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1267 return False |
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1268 raise TypeError("Instance and class checks can only be used with" |
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1269 " @runtime protocols") |
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1270 if (self.__dict__.get('_is_runtime_protocol', None) and |
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1271 not _is_callable_members_only(self)): |
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1272 if sys._getframe(1).f_globals['__name__'] in ['abc', |
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1273 'functools', |
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1274 'typing']: |
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1275 return super(GenericMeta, self).__subclasscheck__(cls) |
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1276 raise TypeError("Protocols with non-method members" |
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1277 " don't support issubclass()") |
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1278 return super(GenericMeta, self).__subclasscheck__(cls) |
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1279 |
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1280 if not OLD_GENERICS: |
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1281 @_tp_cache |
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1282 def __getitem__(self, params): |
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1283 # We also need to copy this from GenericMeta.__getitem__ to get |
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1284 # special treatment of "Protocol". (Comments removed for brevity.) |
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1285 if not isinstance(params, tuple): |
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1286 params = (params,) |
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1287 if not params and _gorg(self) is not Tuple: |
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1288 raise TypeError( |
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1289 "Parameter list to %s[...] cannot be empty" % self.__qualname__) |
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1290 msg = "Parameters to generic types must be types." |
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1291 params = tuple(_type_check(p, msg) for p in params) |
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1292 if self in (Generic, Protocol): |
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1293 if not all(isinstance(p, TypeVar) for p in params): |
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1294 raise TypeError( |
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1295 "Parameters to %r[...] must all be type variables" % self) |
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1296 if len(set(params)) != len(params): |
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1297 raise TypeError( |
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1298 "Parameters to %r[...] must all be unique" % self) |
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1299 tvars = params |
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1300 args = params |
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1301 elif self in (Tuple, Callable): |
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1302 tvars = _type_vars(params) |
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1303 args = params |
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1304 elif self.__origin__ in (Generic, Protocol): |
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1305 raise TypeError("Cannot subscript already-subscripted %s" % |
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1306 repr(self)) |
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1307 else: |
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1308 _check_generic(self, params) |
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1309 tvars = _type_vars(params) |
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1310 args = params |
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1311 |
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1312 prepend = (self,) if self.__origin__ is None else () |
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1313 return self.__class__(self.__name__, |
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1314 prepend + self.__bases__, |
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1315 _no_slots_copy(self.__dict__), |
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1316 tvars=tvars, |
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1317 args=args, |
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1318 origin=self, |
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1319 extra=self.__extra__, |
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1320 orig_bases=self.__orig_bases__) |
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1321 |
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1322 class Protocol(metaclass=_ProtocolMeta): |
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1323 """Base class for protocol classes. Protocol classes are defined as:: |
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1324 |
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1325 class Proto(Protocol): |
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1326 def meth(self) -> int: |
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1327 ... |
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1328 |
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1329 Such classes are primarily used with static type checkers that recognize |
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1330 structural subtyping (static duck-typing), for example:: |
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1331 |
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1332 class C: |
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1333 def meth(self) -> int: |
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1334 return 0 |
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1335 |
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1336 def func(x: Proto) -> int: |
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1337 return x.meth() |
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1338 |
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1339 func(C()) # Passes static type check |
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1340 |
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1341 See PEP 544 for details. Protocol classes decorated with |
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1342 @typing_extensions.runtime act as simple-minded runtime protocol that checks |
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1343 only the presence of given attributes, ignoring their type signatures. |
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1344 |
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1345 Protocol classes can be generic, they are defined as:: |
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1346 |
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1347 class GenProto({bases}): |
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1348 def meth(self) -> T: |
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1349 ... |
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1350 """ |
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1351 __slots__ = () |
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1352 _is_protocol = True |
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1353 |
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1354 def __new__(cls, *args, **kwds): |
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1355 if _gorg(cls) is Protocol: |
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1356 raise TypeError("Type Protocol cannot be instantiated; " |
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1357 "it can be used only as a base class") |
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1358 if OLD_GENERICS: |
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1359 return _generic_new(_next_in_mro(cls), cls, *args, **kwds) |
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1360 return _generic_new(cls.__next_in_mro__, cls, *args, **kwds) |
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1361 if Protocol.__doc__ is not None: |
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1362 Protocol.__doc__ = Protocol.__doc__.format(bases="Protocol, Generic[T]" if |
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1363 OLD_GENERICS else "Protocol[T]") |
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1364 |
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1365 |
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1366 elif PEP_560: |
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1367 from typing import _type_check, _GenericAlias, _collect_type_vars # noqa |
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1368 |
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1369 class _ProtocolMeta(abc.ABCMeta): |
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1370 # This metaclass is a bit unfortunate and exists only because of the lack |
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1371 # of __instancehook__. |
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1372 def __instancecheck__(cls, instance): |
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1373 # We need this method for situations where attributes are |
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1374 # assigned in __init__. |
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1375 if ((not getattr(cls, '_is_protocol', False) or |
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1376 _is_callable_members_only(cls)) and |
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1377 issubclass(instance.__class__, cls)): |
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1378 return True |
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1379 if cls._is_protocol: |
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1380 if all(hasattr(instance, attr) and |
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1381 (not callable(getattr(cls, attr, None)) or |
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1382 getattr(instance, attr) is not None) |
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1383 for attr in _get_protocol_attrs(cls)): |
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1384 return True |
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1385 return super().__instancecheck__(instance) |
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1386 |
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1387 class Protocol(metaclass=_ProtocolMeta): |
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1388 # There is quite a lot of overlapping code with typing.Generic. |
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1389 # Unfortunately it is hard to avoid this while these live in two different |
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1390 # modules. The duplicated code will be removed when Protocol is moved to typing. |
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1391 """Base class for protocol classes. Protocol classes are defined as:: |
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1392 |
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1393 class Proto(Protocol): |
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1394 def meth(self) -> int: |
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1395 ... |
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1396 |
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1397 Such classes are primarily used with static type checkers that recognize |
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1398 structural subtyping (static duck-typing), for example:: |
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1399 |
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1400 class C: |
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1401 def meth(self) -> int: |
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1402 return 0 |
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1403 |
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1404 def func(x: Proto) -> int: |
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1405 return x.meth() |
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1406 |
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1407 func(C()) # Passes static type check |
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1408 |
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1409 See PEP 544 for details. Protocol classes decorated with |
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1410 @typing_extensions.runtime act as simple-minded runtime protocol that checks |
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1411 only the presence of given attributes, ignoring their type signatures. |
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1412 |
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1413 Protocol classes can be generic, they are defined as:: |
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1414 |
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1415 class GenProto(Protocol[T]): |
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1416 def meth(self) -> T: |
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1417 ... |
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1418 """ |
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1419 __slots__ = () |
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1420 _is_protocol = True |
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1421 |
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1422 def __new__(cls, *args, **kwds): |
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1423 if cls is Protocol: |
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1424 raise TypeError("Type Protocol cannot be instantiated; " |
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1425 "it can only be used as a base class") |
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1426 return super().__new__(cls) |
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1427 |
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1428 @_tp_cache |
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1429 def __class_getitem__(cls, params): |
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1430 if not isinstance(params, tuple): |
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1431 params = (params,) |
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1432 if not params and cls is not Tuple: |
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1433 raise TypeError( |
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1434 "Parameter list to {}[...] cannot be empty".format(cls.__qualname__)) |
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1435 msg = "Parameters to generic types must be types." |
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1436 params = tuple(_type_check(p, msg) for p in params) |
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1437 if cls is Protocol: |
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1438 # Generic can only be subscripted with unique type variables. |
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1439 if not all(isinstance(p, TypeVar) for p in params): |
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1440 i = 0 |
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1441 while isinstance(params[i], TypeVar): |
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1442 i += 1 |
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1443 raise TypeError( |
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1444 "Parameters to Protocol[...] must all be type variables." |
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1445 " Parameter {} is {}".format(i + 1, params[i])) |
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1446 if len(set(params)) != len(params): |
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1447 raise TypeError( |
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1448 "Parameters to Protocol[...] must all be unique") |
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1449 else: |
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1450 # Subscripting a regular Generic subclass. |
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1451 _check_generic(cls, params) |
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1452 return _GenericAlias(cls, params) |
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1453 |
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1454 def __init_subclass__(cls, *args, **kwargs): |
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1455 tvars = [] |
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1456 if '__orig_bases__' in cls.__dict__: |
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1457 error = Generic in cls.__orig_bases__ |
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1458 else: |
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1459 error = Generic in cls.__bases__ |
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1460 if error: |
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1461 raise TypeError("Cannot inherit from plain Generic") |
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1462 if '__orig_bases__' in cls.__dict__: |
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1463 tvars = _collect_type_vars(cls.__orig_bases__) |
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1464 # Look for Generic[T1, ..., Tn] or Protocol[T1, ..., Tn]. |
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1465 # If found, tvars must be a subset of it. |
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1466 # If not found, tvars is it. |
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1467 # Also check for and reject plain Generic, |
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1468 # and reject multiple Generic[...] and/or Protocol[...]. |
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1469 gvars = None |
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|
1470 for base in cls.__orig_bases__: |
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1471 if (isinstance(base, _GenericAlias) and |
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1472 base.__origin__ in (Generic, Protocol)): |
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|
1473 # for error messages |
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1474 the_base = 'Generic' if base.__origin__ is Generic else 'Protocol' |
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1475 if gvars is not None: |
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1476 raise TypeError( |
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|
1477 "Cannot inherit from Generic[...]" |
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1478 " and/or Protocol[...] multiple types.") |
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1479 gvars = base.__parameters__ |
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1480 if gvars is None: |
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1481 gvars = tvars |
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1482 else: |
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1483 tvarset = set(tvars) |
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1484 gvarset = set(gvars) |
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1485 if not tvarset <= gvarset: |
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1486 s_vars = ', '.join(str(t) for t in tvars if t not in gvarset) |
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1487 s_args = ', '.join(str(g) for g in gvars) |
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1488 raise TypeError("Some type variables ({}) are" |
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1489 " not listed in {}[{}]".format(s_vars, |
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1490 the_base, s_args)) |
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1491 tvars = gvars |
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1492 cls.__parameters__ = tuple(tvars) |
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1493 |
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1494 # Determine if this is a protocol or a concrete subclass. |
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1495 if not cls.__dict__.get('_is_protocol', None): |
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1496 cls._is_protocol = any(b is Protocol for b in cls.__bases__) |
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1497 |
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1498 # Set (or override) the protocol subclass hook. |
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1499 def _proto_hook(other): |
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1500 if not cls.__dict__.get('_is_protocol', None): |
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1501 return NotImplemented |
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1502 if not getattr(cls, '_is_runtime_protocol', False): |
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1503 if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']: |
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1504 return NotImplemented |
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1505 raise TypeError("Instance and class checks can only be used with" |
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1506 " @runtime protocols") |
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1507 if not _is_callable_members_only(cls): |
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1508 if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']: |
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1509 return NotImplemented |
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1510 raise TypeError("Protocols with non-method members" |
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1511 " don't support issubclass()") |
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1512 if not isinstance(other, type): |
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1513 # Same error as for issubclass(1, int) |
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1514 raise TypeError('issubclass() arg 1 must be a class') |
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1515 for attr in _get_protocol_attrs(cls): |
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1516 for base in other.__mro__: |
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1517 if attr in base.__dict__: |
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1518 if base.__dict__[attr] is None: |
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1519 return NotImplemented |
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1520 break |
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1521 annotations = getattr(base, '__annotations__', {}) |
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1522 if (isinstance(annotations, typing.Mapping) and |
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1523 attr in annotations and |
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1524 isinstance(other, _ProtocolMeta) and |
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1525 other._is_protocol): |
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1526 break |
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1527 else: |
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|
1528 return NotImplemented |
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|
1529 return True |
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1530 if '__subclasshook__' not in cls.__dict__: |
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1531 cls.__subclasshook__ = _proto_hook |
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1532 |
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1533 # We have nothing more to do for non-protocols. |
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1534 if not cls._is_protocol: |
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|
1535 return |
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|
1536 |
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|
1537 # Check consistency of bases. |
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1538 for base in cls.__bases__: |
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|
1539 if not (base in (object, Generic) or |
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1540 base.__module__ == 'collections.abc' and |
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1541 base.__name__ in _PROTO_WHITELIST or |
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|
1542 isinstance(base, _ProtocolMeta) and base._is_protocol): |
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1543 raise TypeError('Protocols can only inherit from other' |
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1544 ' protocols, got %r' % base) |
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1545 |
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|
1546 def _no_init(self, *args, **kwargs): |
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|
1547 if type(self)._is_protocol: |
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|
1548 raise TypeError('Protocols cannot be instantiated') |
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|
1549 cls.__init__ = _no_init |
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1550 |
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|
1551 |
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|
1552 if hasattr(typing, 'runtime_checkable'): |
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|
1553 runtime_checkable = typing.runtime_checkable |
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|
1554 elif HAVE_PROTOCOLS: |
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|
1555 def runtime_checkable(cls): |
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|
1556 """Mark a protocol class as a runtime protocol, so that it |
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|
1557 can be used with isinstance() and issubclass(). Raise TypeError |
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|
1558 if applied to a non-protocol class. |
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|
1559 |
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|
1560 This allows a simple-minded structural check very similar to the |
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|
1561 one-offs in collections.abc such as Hashable. |
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|
1562 """ |
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|
1563 if not isinstance(cls, _ProtocolMeta) or not cls._is_protocol: |
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|
1564 raise TypeError('@runtime_checkable can be only applied to protocol classes,' |
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|
1565 ' got %r' % cls) |
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|
1566 cls._is_runtime_protocol = True |
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|
1567 return cls |
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|
1568 |
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|
1569 |
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|
1570 if HAVE_PROTOCOLS: |
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|
1571 # Exists for backwards compatibility. |
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|
1572 runtime = runtime_checkable |
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|
1573 |
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|
1574 |
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|
1575 if hasattr(typing, 'SupportsIndex'): |
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|
1576 SupportsIndex = typing.SupportsIndex |
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|
1577 elif HAVE_PROTOCOLS: |
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1578 @runtime_checkable |
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1579 class SupportsIndex(Protocol): |
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1580 __slots__ = () |
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1581 |
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1582 @abc.abstractmethod |
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1583 def __index__(self) -> int: |
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1584 pass |
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1585 |
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1586 |
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1587 if sys.version_info[:2] >= (3, 9): |
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1588 # The standard library TypedDict in Python 3.8 does not store runtime information |
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1589 # about which (if any) keys are optional. See https://bugs.python.org/issue38834 |
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1590 TypedDict = typing.TypedDict |
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1591 else: |
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1592 def _check_fails(cls, other): |
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1593 try: |
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1594 if sys._getframe(1).f_globals['__name__'] not in ['abc', |
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1595 'functools', |
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1596 'typing']: |
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1597 # Typed dicts are only for static structural subtyping. |
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1598 raise TypeError('TypedDict does not support instance and class checks') |
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1599 except (AttributeError, ValueError): |
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1600 pass |
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1601 return False |
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1602 |
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1603 def _dict_new(*args, **kwargs): |
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1604 if not args: |
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1605 raise TypeError('TypedDict.__new__(): not enough arguments') |
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1606 _, args = args[0], args[1:] # allow the "cls" keyword be passed |
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1607 return dict(*args, **kwargs) |
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1608 |
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1609 _dict_new.__text_signature__ = '($cls, _typename, _fields=None, /, **kwargs)' |
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1610 |
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1611 def _typeddict_new(*args, total=True, **kwargs): |
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1612 if not args: |
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1613 raise TypeError('TypedDict.__new__(): not enough arguments') |
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1614 _, args = args[0], args[1:] # allow the "cls" keyword be passed |
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1615 if args: |
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1616 typename, args = args[0], args[1:] # allow the "_typename" keyword be passed |
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1617 elif '_typename' in kwargs: |
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1618 typename = kwargs.pop('_typename') |
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1619 import warnings |
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1620 warnings.warn("Passing '_typename' as keyword argument is deprecated", |
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1621 DeprecationWarning, stacklevel=2) |
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1622 else: |
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1623 raise TypeError("TypedDict.__new__() missing 1 required positional " |
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1624 "argument: '_typename'") |
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1625 if args: |
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1626 try: |
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1627 fields, = args # allow the "_fields" keyword be passed |
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1628 except ValueError: |
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1629 raise TypeError('TypedDict.__new__() takes from 2 to 3 ' |
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1630 'positional arguments but {} ' |
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1631 'were given'.format(len(args) + 2)) |
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1632 elif '_fields' in kwargs and len(kwargs) == 1: |
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1633 fields = kwargs.pop('_fields') |
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1634 import warnings |
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1635 warnings.warn("Passing '_fields' as keyword argument is deprecated", |
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1636 DeprecationWarning, stacklevel=2) |
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1637 else: |
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1638 fields = None |
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1639 |
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1640 if fields is None: |
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1641 fields = kwargs |
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1642 elif kwargs: |
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1643 raise TypeError("TypedDict takes either a dict or keyword arguments," |
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1644 " but not both") |
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1645 |
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1646 ns = {'__annotations__': dict(fields), '__total__': total} |
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1647 try: |
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1648 # Setting correct module is necessary to make typed dict classes pickleable. |
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1649 ns['__module__'] = sys._getframe(1).f_globals.get('__name__', '__main__') |
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1650 except (AttributeError, ValueError): |
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1651 pass |
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1652 |
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1653 return _TypedDictMeta(typename, (), ns) |
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1654 |
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1655 _typeddict_new.__text_signature__ = ('($cls, _typename, _fields=None,' |
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1656 ' /, *, total=True, **kwargs)') |
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1657 |
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1658 class _TypedDictMeta(type): |
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1659 def __new__(cls, name, bases, ns, total=True): |
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1660 # Create new typed dict class object. |
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1661 # This method is called directly when TypedDict is subclassed, |
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1662 # or via _typeddict_new when TypedDict is instantiated. This way |
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1663 # TypedDict supports all three syntaxes described in its docstring. |
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1664 # Subclasses and instances of TypedDict return actual dictionaries |
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1665 # via _dict_new. |
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1666 ns['__new__'] = _typeddict_new if name == 'TypedDict' else _dict_new |
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1667 tp_dict = super(_TypedDictMeta, cls).__new__(cls, name, (dict,), ns) |
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1668 |
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1669 annotations = {} |
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1670 own_annotations = ns.get('__annotations__', {}) |
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1671 own_annotation_keys = set(own_annotations.keys()) |
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1672 msg = "TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a type" |
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1673 own_annotations = { |
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1674 n: typing._type_check(tp, msg) for n, tp in own_annotations.items() |
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1675 } |
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1676 required_keys = set() |
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1677 optional_keys = set() |
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1678 |
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1679 for base in bases: |
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1680 annotations.update(base.__dict__.get('__annotations__', {})) |
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1681 required_keys.update(base.__dict__.get('__required_keys__', ())) |
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1682 optional_keys.update(base.__dict__.get('__optional_keys__', ())) |
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1683 |
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1684 annotations.update(own_annotations) |
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1685 if total: |
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1686 required_keys.update(own_annotation_keys) |
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1687 else: |
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1688 optional_keys.update(own_annotation_keys) |
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1689 |
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1690 tp_dict.__annotations__ = annotations |
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1691 tp_dict.__required_keys__ = frozenset(required_keys) |
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1692 tp_dict.__optional_keys__ = frozenset(optional_keys) |
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1693 if not hasattr(tp_dict, '__total__'): |
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1694 tp_dict.__total__ = total |
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1695 return tp_dict |
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1696 |
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1697 __instancecheck__ = __subclasscheck__ = _check_fails |
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1698 |
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1699 TypedDict = _TypedDictMeta('TypedDict', (dict,), {}) |
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1700 TypedDict.__module__ = __name__ |
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1701 TypedDict.__doc__ = \ |
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1702 """A simple typed name space. At runtime it is equivalent to a plain dict. |
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1703 |
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1704 TypedDict creates a dictionary type that expects all of its |
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1705 instances to have a certain set of keys, with each key |
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1706 associated with a value of a consistent type. This expectation |
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1707 is not checked at runtime but is only enforced by type checkers. |
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1708 Usage:: |
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1709 |
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1710 class Point2D(TypedDict): |
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1711 x: int |
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1712 y: int |
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1713 label: str |
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1714 |
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1715 a: Point2D = {'x': 1, 'y': 2, 'label': 'good'} # OK |
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1716 b: Point2D = {'z': 3, 'label': 'bad'} # Fails type check |
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1717 |
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1718 assert Point2D(x=1, y=2, label='first') == dict(x=1, y=2, label='first') |
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1719 |
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1720 The type info can be accessed via the Point2D.__annotations__ dict, and |
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1721 the Point2D.__required_keys__ and Point2D.__optional_keys__ frozensets. |
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1722 TypedDict supports two additional equivalent forms:: |
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1723 |
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1724 Point2D = TypedDict('Point2D', x=int, y=int, label=str) |
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1725 Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str}) |
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1726 |
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1727 The class syntax is only supported in Python 3.6+, while two other |
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1728 syntax forms work for Python 2.7 and 3.2+ |
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1729 """ |
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1730 |
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1731 |
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1732 # Python 3.9+ has PEP 593 (Annotated and modified get_type_hints) |
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1733 if hasattr(typing, 'Annotated'): |
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1734 Annotated = typing.Annotated |
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1735 get_type_hints = typing.get_type_hints |
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1736 # Not exported and not a public API, but needed for get_origin() and get_args() |
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1737 # to work. |
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1738 _AnnotatedAlias = typing._AnnotatedAlias |
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1739 elif PEP_560: |
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1740 class _AnnotatedAlias(typing._GenericAlias, _root=True): |
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1741 """Runtime representation of an annotated type. |
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1742 |
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1743 At its core 'Annotated[t, dec1, dec2, ...]' is an alias for the type 't' |
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1744 with extra annotations. The alias behaves like a normal typing alias, |
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1745 instantiating is the same as instantiating the underlying type, binding |
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1746 it to types is also the same. |
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1747 """ |
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1748 def __init__(self, origin, metadata): |
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1749 if isinstance(origin, _AnnotatedAlias): |
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1750 metadata = origin.__metadata__ + metadata |
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1751 origin = origin.__origin__ |
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1752 super().__init__(origin, origin) |
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1753 self.__metadata__ = metadata |
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1754 |
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1755 def copy_with(self, params): |
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1756 assert len(params) == 1 |
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1757 new_type = params[0] |
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1758 return _AnnotatedAlias(new_type, self.__metadata__) |
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1759 |
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1760 def __repr__(self): |
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1761 return "typing_extensions.Annotated[{}, {}]".format( |
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1762 typing._type_repr(self.__origin__), |
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1763 ", ".join(repr(a) for a in self.__metadata__) |
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1764 ) |
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1765 |
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1766 def __reduce__(self): |
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1767 return operator.getitem, ( |
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1768 Annotated, (self.__origin__,) + self.__metadata__ |
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1769 ) |
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1770 |
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1771 def __eq__(self, other): |
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1772 if not isinstance(other, _AnnotatedAlias): |
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1773 return NotImplemented |
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1774 if self.__origin__ != other.__origin__: |
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1775 return False |
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1776 return self.__metadata__ == other.__metadata__ |
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1777 |
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1778 def __hash__(self): |
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1779 return hash((self.__origin__, self.__metadata__)) |
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1780 |
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1781 class Annotated: |
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1782 """Add context specific metadata to a type. |
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1783 |
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1784 Example: Annotated[int, runtime_check.Unsigned] indicates to the |
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1785 hypothetical runtime_check module that this type is an unsigned int. |
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1786 Every other consumer of this type can ignore this metadata and treat |
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1787 this type as int. |
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1788 |
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1789 The first argument to Annotated must be a valid type (and will be in |
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1790 the __origin__ field), the remaining arguments are kept as a tuple in |
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1791 the __extra__ field. |
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1792 |
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1793 Details: |
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1794 |
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1795 - It's an error to call `Annotated` with less than two arguments. |
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1796 - Nested Annotated are flattened:: |
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1797 |
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1798 Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3] |
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1799 |
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1800 - Instantiating an annotated type is equivalent to instantiating the |
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1801 underlying type:: |
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1802 |
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1803 Annotated[C, Ann1](5) == C(5) |
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1804 |
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1805 - Annotated can be used as a generic type alias:: |
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1806 |
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1807 Optimized = Annotated[T, runtime.Optimize()] |
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1808 Optimized[int] == Annotated[int, runtime.Optimize()] |
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1809 |
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1810 OptimizedList = Annotated[List[T], runtime.Optimize()] |
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1811 OptimizedList[int] == Annotated[List[int], runtime.Optimize()] |
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1812 """ |
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1813 |
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1814 __slots__ = () |
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1815 |
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1816 def __new__(cls, *args, **kwargs): |
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1817 raise TypeError("Type Annotated cannot be instantiated.") |
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1818 |
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1819 @_tp_cache |
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1820 def __class_getitem__(cls, params): |
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1821 if not isinstance(params, tuple) or len(params) < 2: |
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1822 raise TypeError("Annotated[...] should be used " |
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1823 "with at least two arguments (a type and an " |
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1824 "annotation).") |
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1825 msg = "Annotated[t, ...]: t must be a type." |
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1826 origin = typing._type_check(params[0], msg) |
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1827 metadata = tuple(params[1:]) |
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1828 return _AnnotatedAlias(origin, metadata) |
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1829 |
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1830 def __init_subclass__(cls, *args, **kwargs): |
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1831 raise TypeError( |
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1832 "Cannot subclass {}.Annotated".format(cls.__module__) |
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1833 ) |
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1834 |
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1835 def _strip_annotations(t): |
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1836 """Strips the annotations from a given type. |
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1837 """ |
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1838 if isinstance(t, _AnnotatedAlias): |
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1839 return _strip_annotations(t.__origin__) |
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1840 if isinstance(t, typing._GenericAlias): |
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1841 stripped_args = tuple(_strip_annotations(a) for a in t.__args__) |
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1842 if stripped_args == t.__args__: |
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1843 return t |
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1844 res = t.copy_with(stripped_args) |
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1845 res._special = t._special |
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1846 return res |
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1847 return t |
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1848 |
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1849 def get_type_hints(obj, globalns=None, localns=None, include_extras=False): |
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1850 """Return type hints for an object. |
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1851 |
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1852 This is often the same as obj.__annotations__, but it handles |
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1853 forward references encoded as string literals, adds Optional[t] if a |
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1854 default value equal to None is set and recursively replaces all |
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1855 'Annotated[T, ...]' with 'T' (unless 'include_extras=True'). |
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1856 |
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1857 The argument may be a module, class, method, or function. The annotations |
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1858 are returned as a dictionary. For classes, annotations include also |
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1859 inherited members. |
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1860 |
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1861 TypeError is raised if the argument is not of a type that can contain |
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1862 annotations, and an empty dictionary is returned if no annotations are |
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1863 present. |
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1864 |
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1865 BEWARE -- the behavior of globalns and localns is counterintuitive |
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1866 (unless you are familiar with how eval() and exec() work). The |
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1867 search order is locals first, then globals. |
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1868 |
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1869 - If no dict arguments are passed, an attempt is made to use the |
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1870 globals from obj (or the respective module's globals for classes), |
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1871 and these are also used as the locals. If the object does not appear |
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1872 to have globals, an empty dictionary is used. |
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1873 |
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1874 - If one dict argument is passed, it is used for both globals and |
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1875 locals. |
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1876 |
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1877 - If two dict arguments are passed, they specify globals and |
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1878 locals, respectively. |
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1879 """ |
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1880 hint = typing.get_type_hints(obj, globalns=globalns, localns=localns) |
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1881 if include_extras: |
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1882 return hint |
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1883 return {k: _strip_annotations(t) for k, t in hint.items()} |
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1884 |
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1885 elif HAVE_ANNOTATED: |
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1886 |
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1887 def _is_dunder(name): |
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1888 """Returns True if name is a __dunder_variable_name__.""" |
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1889 return len(name) > 4 and name.startswith('__') and name.endswith('__') |
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1890 |
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1891 # Prior to Python 3.7 types did not have `copy_with`. A lot of the equality |
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1892 # checks, argument expansion etc. are done on the _subs_tre. As a result we |
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1893 # can't provide a get_type_hints function that strips out annotations. |
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1894 |
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1895 class AnnotatedMeta(typing.GenericMeta): |
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1896 """Metaclass for Annotated""" |
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1897 |
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1898 def __new__(cls, name, bases, namespace, **kwargs): |
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1899 if any(b is not object for b in bases): |
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1900 raise TypeError("Cannot subclass " + str(Annotated)) |
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1901 return super().__new__(cls, name, bases, namespace, **kwargs) |
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1902 |
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1903 @property |
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1904 def __metadata__(self): |
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1905 return self._subs_tree()[2] |
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1906 |
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1907 def _tree_repr(self, tree): |
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1908 cls, origin, metadata = tree |
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1909 if not isinstance(origin, tuple): |
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1910 tp_repr = typing._type_repr(origin) |
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1911 else: |
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1912 tp_repr = origin[0]._tree_repr(origin) |
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1913 metadata_reprs = ", ".join(repr(arg) for arg in metadata) |
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1914 return '%s[%s, %s]' % (cls, tp_repr, metadata_reprs) |
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1915 |
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1916 def _subs_tree(self, tvars=None, args=None): # noqa |
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1917 if self is Annotated: |
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1918 return Annotated |
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1919 res = super()._subs_tree(tvars=tvars, args=args) |
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1920 # Flatten nested Annotated |
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1921 if isinstance(res[1], tuple) and res[1][0] is Annotated: |
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1922 sub_tp = res[1][1] |
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1923 sub_annot = res[1][2] |
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1924 return (Annotated, sub_tp, sub_annot + res[2]) |
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1925 return res |
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1926 |
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1927 def _get_cons(self): |
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1928 """Return the class used to create instance of this type.""" |
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1929 if self.__origin__ is None: |
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1930 raise TypeError("Cannot get the underlying type of a " |
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1931 "non-specialized Annotated type.") |
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1932 tree = self._subs_tree() |
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1933 while isinstance(tree, tuple) and tree[0] is Annotated: |
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1934 tree = tree[1] |
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1935 if isinstance(tree, tuple): |
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1936 return tree[0] |
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1937 else: |
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1938 return tree |
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1939 |
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1940 @_tp_cache |
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1941 def __getitem__(self, params): |
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1942 if not isinstance(params, tuple): |
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1943 params = (params,) |
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1944 if self.__origin__ is not None: # specializing an instantiated type |
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1945 return super().__getitem__(params) |
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1946 elif not isinstance(params, tuple) or len(params) < 2: |
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1947 raise TypeError("Annotated[...] should be instantiated " |
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1948 "with at least two arguments (a type and an " |
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1949 "annotation).") |
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1950 else: |
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1951 msg = "Annotated[t, ...]: t must be a type." |
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1952 tp = typing._type_check(params[0], msg) |
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1953 metadata = tuple(params[1:]) |
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1954 return self.__class__( |
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1955 self.__name__, |
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1956 self.__bases__, |
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1957 _no_slots_copy(self.__dict__), |
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1958 tvars=_type_vars((tp,)), |
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1959 # Metadata is a tuple so it won't be touched by _replace_args et al. |
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1960 args=(tp, metadata), |
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1961 origin=self, |
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1962 ) |
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1963 |
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1964 def __call__(self, *args, **kwargs): |
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1965 cons = self._get_cons() |
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1966 result = cons(*args, **kwargs) |
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1967 try: |
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1968 result.__orig_class__ = self |
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1969 except AttributeError: |
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1970 pass |
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1971 return result |
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1972 |
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1973 def __getattr__(self, attr): |
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1974 # For simplicity we just don't relay all dunder names |
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1975 if self.__origin__ is not None and not _is_dunder(attr): |
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1976 return getattr(self._get_cons(), attr) |
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1977 raise AttributeError(attr) |
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1978 |
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1979 def __setattr__(self, attr, value): |
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1980 if _is_dunder(attr) or attr.startswith('_abc_'): |
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1981 super().__setattr__(attr, value) |
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1982 elif self.__origin__ is None: |
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1983 raise AttributeError(attr) |
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1984 else: |
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1985 setattr(self._get_cons(), attr, value) |
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1986 |
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1987 def __instancecheck__(self, obj): |
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1988 raise TypeError("Annotated cannot be used with isinstance().") |
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1989 |
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1990 def __subclasscheck__(self, cls): |
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1991 raise TypeError("Annotated cannot be used with issubclass().") |
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1992 |
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1993 class Annotated(metaclass=AnnotatedMeta): |
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1994 """Add context specific metadata to a type. |
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1995 |
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1996 Example: Annotated[int, runtime_check.Unsigned] indicates to the |
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1997 hypothetical runtime_check module that this type is an unsigned int. |
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1998 Every other consumer of this type can ignore this metadata and treat |
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1999 this type as int. |
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2000 |
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2001 The first argument to Annotated must be a valid type, the remaining |
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2002 arguments are kept as a tuple in the __metadata__ field. |
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2003 |
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2004 Details: |
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2005 |
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2006 - It's an error to call `Annotated` with less than two arguments. |
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2007 - Nested Annotated are flattened:: |
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2008 |
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2009 Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3] |
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2010 |
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2011 - Instantiating an annotated type is equivalent to instantiating the |
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2012 underlying type:: |
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2013 |
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2014 Annotated[C, Ann1](5) == C(5) |
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2015 |
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2016 - Annotated can be used as a generic type alias:: |
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2017 |
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2018 Optimized = Annotated[T, runtime.Optimize()] |
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2019 Optimized[int] == Annotated[int, runtime.Optimize()] |
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2020 |
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2021 OptimizedList = Annotated[List[T], runtime.Optimize()] |
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2022 OptimizedList[int] == Annotated[List[int], runtime.Optimize()] |
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2023 """ |
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2024 |
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2025 # Python 3.8 has get_origin() and get_args() but those implementations aren't |
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2026 # Annotated-aware, so we can't use those, only Python 3.9 versions will do. |
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2027 if sys.version_info[:2] >= (3, 9): |
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2028 get_origin = typing.get_origin |
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2029 get_args = typing.get_args |
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2030 elif PEP_560: |
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2031 from typing import _GenericAlias # noqa |
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2032 |
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2033 def get_origin(tp): |
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2034 """Get the unsubscripted version of a type. |
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2035 |
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2036 This supports generic types, Callable, Tuple, Union, Literal, Final, ClassVar |
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2037 and Annotated. Return None for unsupported types. Examples:: |
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2038 |
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2039 get_origin(Literal[42]) is Literal |
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2040 get_origin(int) is None |
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2041 get_origin(ClassVar[int]) is ClassVar |
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2042 get_origin(Generic) is Generic |
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2043 get_origin(Generic[T]) is Generic |
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2044 get_origin(Union[T, int]) is Union |
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2045 get_origin(List[Tuple[T, T]][int]) == list |
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2046 """ |
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2047 if isinstance(tp, _AnnotatedAlias): |
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2048 return Annotated |
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2049 if isinstance(tp, _GenericAlias): |
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2050 return tp.__origin__ |
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2051 if tp is Generic: |
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2052 return Generic |
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2053 return None |
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2054 |
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2055 def get_args(tp): |
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2056 """Get type arguments with all substitutions performed. |
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2057 |
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2058 For unions, basic simplifications used by Union constructor are performed. |
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2059 Examples:: |
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2060 get_args(Dict[str, int]) == (str, int) |
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2061 get_args(int) == () |
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2062 get_args(Union[int, Union[T, int], str][int]) == (int, str) |
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2063 get_args(Union[int, Tuple[T, int]][str]) == (int, Tuple[str, int]) |
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2064 get_args(Callable[[], T][int]) == ([], int) |
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2065 """ |
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2066 if isinstance(tp, _AnnotatedAlias): |
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2067 return (tp.__origin__,) + tp.__metadata__ |
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2068 if isinstance(tp, _GenericAlias): |
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2069 res = tp.__args__ |
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2070 if get_origin(tp) is collections.abc.Callable and res[0] is not Ellipsis: |
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2071 res = (list(res[:-1]), res[-1]) |
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2072 return res |
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2073 return () |
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2074 |
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2075 |
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2076 if hasattr(typing, 'TypeAlias'): |
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2077 TypeAlias = typing.TypeAlias |
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2078 elif sys.version_info[:2] >= (3, 9): |
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2079 class _TypeAliasForm(typing._SpecialForm, _root=True): |
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2080 def __repr__(self): |
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2081 return 'typing_extensions.' + self._name |
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2082 |
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2083 @_TypeAliasForm |
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2084 def TypeAlias(self, parameters): |
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2085 """Special marker indicating that an assignment should |
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2086 be recognized as a proper type alias definition by type |
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2087 checkers. |
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2088 |
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2089 For example:: |
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2090 |
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2091 Predicate: TypeAlias = Callable[..., bool] |
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2092 |
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2093 It's invalid when used anywhere except as in the example above. |
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2094 """ |
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2095 raise TypeError("{} is not subscriptable".format(self)) |
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2096 |
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2097 elif sys.version_info[:2] >= (3, 7): |
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2098 class _TypeAliasForm(typing._SpecialForm, _root=True): |
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2099 def __repr__(self): |
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2100 return 'typing_extensions.' + self._name |
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2101 |
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2102 TypeAlias = _TypeAliasForm('TypeAlias', |
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2103 doc="""Special marker indicating that an assignment should |
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2104 be recognized as a proper type alias definition by type |
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2105 checkers. |
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2106 |
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2107 For example:: |
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2108 |
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2109 Predicate: TypeAlias = Callable[..., bool] |
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2110 |
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2111 It's invalid when used anywhere except as in the example |
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2112 above.""") |
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2113 |
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2114 elif hasattr(typing, '_FinalTypingBase'): |
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2115 class _TypeAliasMeta(typing.TypingMeta): |
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2116 """Metaclass for TypeAlias""" |
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2117 |
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2118 def __repr__(self): |
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2119 return 'typing_extensions.TypeAlias' |
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2120 |
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2121 class _TypeAliasBase(typing._FinalTypingBase, metaclass=_TypeAliasMeta, _root=True): |
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2122 """Special marker indicating that an assignment should |
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2123 be recognized as a proper type alias definition by type |
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2124 checkers. |
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2125 |
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2126 For example:: |
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2127 |
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2128 Predicate: TypeAlias = Callable[..., bool] |
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2129 |
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2130 It's invalid when used anywhere except as in the example above. |
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2131 """ |
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2132 __slots__ = () |
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2133 |
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2134 def __instancecheck__(self, obj): |
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2135 raise TypeError("TypeAlias cannot be used with isinstance().") |
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2136 |
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2137 def __subclasscheck__(self, cls): |
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2138 raise TypeError("TypeAlias cannot be used with issubclass().") |
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2139 |
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2140 def __repr__(self): |
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2141 return 'typing_extensions.TypeAlias' |
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2142 |
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2143 TypeAlias = _TypeAliasBase(_root=True) |
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2144 else: |
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2145 class _TypeAliasMeta(typing.TypingMeta): |
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2146 """Metaclass for TypeAlias""" |
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2147 |
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2148 def __instancecheck__(self, obj): |
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2149 raise TypeError("TypeAlias cannot be used with isinstance().") |
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2150 |
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2151 def __subclasscheck__(self, cls): |
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2152 raise TypeError("TypeAlias cannot be used with issubclass().") |
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2153 |
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2154 def __call__(self, *args, **kwargs): |
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2155 raise TypeError("Cannot instantiate TypeAlias") |
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2156 |
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2157 class TypeAlias(metaclass=_TypeAliasMeta, _root=True): |
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2158 """Special marker indicating that an assignment should |
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2159 be recognized as a proper type alias definition by type |
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2160 checkers. |
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2161 |
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2162 For example:: |
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2163 |
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2164 Predicate: TypeAlias = Callable[..., bool] |
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2165 |
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2166 It's invalid when used anywhere except as in the example above. |
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2167 """ |
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2168 __slots__ = () |