Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/classes/reportviews.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """ |
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2 View Classes provide node, edge and degree "views" of a graph. |
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3 |
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4 Views for nodes, edges and degree are provided for all base graph classes. |
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5 A view means a read-only object that is quick to create, automatically |
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6 updated when the graph changes, and provides basic access like `n in V`, |
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7 `for n in V`, `V[n]` and sometimes set operations. |
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8 |
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9 The views are read-only iterable containers that are updated as the |
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10 graph is updated. As with dicts, the graph should not be updated |
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11 while iterating through the view. Views can be iterated multiple times. |
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12 |
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13 Edge and Node views also allow data attribute lookup. |
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14 The resulting attribute dict is writable as `G.edges[3, 4]['color']='red'` |
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15 Degree views allow lookup of degree values for single nodes. |
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16 Weighted degree is supported with the `weight` argument. |
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17 |
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18 NodeView |
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19 ======== |
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20 |
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21 `V = G.nodes` (or `V = G.nodes()`) allows `len(V)`, `n in V`, set |
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22 operations e.g. "G.nodes & H.nodes", and `dd = G.nodes[n]`, where |
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23 `dd` is the node data dict. Iteration is over the nodes by default. |
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24 |
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25 NodeDataView |
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26 ============ |
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27 |
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28 To iterate over (node, data) pairs, use arguments to `G.nodes()` |
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29 to create a DataView e.g. `DV = G.nodes(data='color', default='red')`. |
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30 The DataView iterates as `for n, color in DV` and allows |
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31 `(n, 'red') in DV`. Using `DV = G.nodes(data=True)`, the DataViews |
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32 use the full datadict in writeable form also allowing contain testing as |
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33 `(n, {'color': 'red'}) in VD`. DataViews allow set operations when |
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34 data attributes are hashable. |
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35 |
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36 DegreeView |
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37 ========== |
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38 |
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39 `V = G.degree` allows iteration over (node, degree) pairs as well |
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40 as lookup: `deg=V[n]`. There are many flavors of DegreeView |
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41 for In/Out/Directed/Multi. For Directed Graphs, `G.degree` |
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42 counts both in and out going edges. `G.out_degree` and |
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43 `G.in_degree` count only specific directions. |
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44 Weighted degree using edge data attributes is provide via |
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45 `V = G.degree(weight='attr_name')` where any string with the |
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46 attribute name can be used. `weight=None` is the default. |
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47 No set operations are implemented for degrees, use NodeView. |
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48 |
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49 The argument `nbunch` restricts iteration to nodes in nbunch. |
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50 The DegreeView can still lookup any node even if nbunch is specified. |
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51 |
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52 EdgeView |
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53 ======== |
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54 |
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55 `V = G.edges` or `V = G.edges()` allows iteration over edges as well as |
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56 `e in V`, set operations and edge data lookup `dd = G.edges[2, 3]`. |
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57 Iteration is over 2-tuples `(u, v)` for Graph/DiGraph. For multigraphs |
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58 edges 3-tuples `(u, v, key)` are the default but 2-tuples can be obtained |
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59 via `V = G.edges(keys=False)`. |
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60 |
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61 Set operations for directed graphs treat the edges as a set of 2-tuples. |
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62 For undirected graphs, 2-tuples are not a unique representation of edges. |
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63 So long as the set being compared to contains unique representations |
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64 of its edges, the set operations will act as expected. If the other |
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65 set contains both `(0, 1)` and `(1, 0)` however, the result of set |
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66 operations may contain both representations of the same edge. |
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67 |
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68 EdgeDataView |
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69 ============ |
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70 |
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71 Edge data can be reported using an EdgeDataView typically created |
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72 by calling an EdgeView: `DV = G.edges(data='weight', default=1)`. |
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73 The EdgeDataView allows iteration over edge tuples, membership checking |
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74 but no set operations. |
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75 |
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76 Iteration depends on `data` and `default` and for multigraph `keys` |
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77 If `data is False` (the default) then iterate over 2-tuples `(u, v)`. |
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78 If `data is True` iterate over 3-tuples `(u, v, datadict)`. |
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79 Otherwise iterate over `(u, v, datadict.get(data, default))`. |
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80 For Multigraphs, if `keys is True`, replace `u, v` with `u, v, key` |
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81 to create 3-tuples and 4-tuples. |
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82 |
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83 The argument `nbunch` restricts edges to those incident to nodes in nbunch. |
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84 """ |
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85 from collections.abc import Mapping, Set |
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86 |
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87 __all__ = [ |
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88 "NodeView", |
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89 "NodeDataView", |
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90 "EdgeView", |
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91 "OutEdgeView", |
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92 "InEdgeView", |
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93 "EdgeDataView", |
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94 "OutEdgeDataView", |
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95 "InEdgeDataView", |
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96 "MultiEdgeView", |
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97 "OutMultiEdgeView", |
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98 "InMultiEdgeView", |
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99 "MultiEdgeDataView", |
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100 "OutMultiEdgeDataView", |
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101 "InMultiEdgeDataView", |
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102 "DegreeView", |
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103 "DiDegreeView", |
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104 "InDegreeView", |
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105 "OutDegreeView", |
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106 "MultiDegreeView", |
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107 "DiMultiDegreeView", |
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108 "InMultiDegreeView", |
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109 "OutMultiDegreeView", |
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110 ] |
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111 |
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112 |
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113 # NodeViews |
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114 class NodeView(Mapping, Set): |
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115 """A NodeView class to act as G.nodes for a NetworkX Graph |
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116 |
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117 Set operations act on the nodes without considering data. |
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118 Iteration is over nodes. Node data can be looked up like a dict. |
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119 Use NodeDataView to iterate over node data or to specify a data |
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120 attribute for lookup. NodeDataView is created by calling the NodeView. |
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121 |
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122 Parameters |
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123 ---------- |
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124 graph : NetworkX graph-like class |
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125 |
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126 Examples |
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127 -------- |
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128 >>> G = nx.path_graph(3) |
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129 >>> NV = G.nodes() |
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130 >>> 2 in NV |
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131 True |
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132 >>> for n in NV: |
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133 ... print(n) |
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134 0 |
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135 1 |
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136 2 |
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137 >>> assert NV & {1, 2, 3} == {1, 2} |
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138 |
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139 >>> G.add_node(2, color="blue") |
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140 >>> NV[2] |
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141 {'color': 'blue'} |
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142 >>> G.add_node(8, color="red") |
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143 >>> NDV = G.nodes(data=True) |
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144 >>> (2, NV[2]) in NDV |
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145 True |
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146 >>> for n, dd in NDV: |
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147 ... print((n, dd.get("color", "aqua"))) |
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148 (0, 'aqua') |
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149 (1, 'aqua') |
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150 (2, 'blue') |
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151 (8, 'red') |
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152 >>> NDV[2] == NV[2] |
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153 True |
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154 |
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155 >>> NVdata = G.nodes(data="color", default="aqua") |
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156 >>> (2, NVdata[2]) in NVdata |
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157 True |
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158 >>> for n, dd in NVdata: |
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159 ... print((n, dd)) |
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160 (0, 'aqua') |
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161 (1, 'aqua') |
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162 (2, 'blue') |
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163 (8, 'red') |
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164 >>> NVdata[2] == NV[2] # NVdata gets 'color', NV gets datadict |
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165 False |
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166 """ |
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167 |
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168 __slots__ = ("_nodes",) |
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169 |
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170 def __getstate__(self): |
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171 return {"_nodes": self._nodes} |
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172 |
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173 def __setstate__(self, state): |
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174 self._nodes = state["_nodes"] |
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175 |
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176 def __init__(self, graph): |
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177 self._nodes = graph._node |
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178 |
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179 # Mapping methods |
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180 def __len__(self): |
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181 return len(self._nodes) |
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182 |
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183 def __iter__(self): |
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184 return iter(self._nodes) |
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185 |
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186 def __getitem__(self, n): |
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187 return self._nodes[n] |
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188 |
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189 # Set methods |
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190 def __contains__(self, n): |
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191 return n in self._nodes |
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192 |
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193 @classmethod |
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194 def _from_iterable(cls, it): |
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195 return set(it) |
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196 |
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197 # DataView method |
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198 def __call__(self, data=False, default=None): |
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199 if data is False: |
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200 return self |
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201 return NodeDataView(self._nodes, data, default) |
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202 |
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203 def data(self, data=True, default=None): |
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204 if data is False: |
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205 return self |
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206 return NodeDataView(self._nodes, data, default) |
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207 |
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208 def __str__(self): |
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209 return str(list(self)) |
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210 |
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211 def __repr__(self): |
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212 return f"{self.__class__.__name__}({tuple(self)})" |
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213 |
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214 |
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215 class NodeDataView(Set): |
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216 """A DataView class for nodes of a NetworkX Graph |
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217 |
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218 The main use for this class is to iterate through node-data pairs. |
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219 The data can be the entire data-dictionary for each node, or it |
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220 can be a specific attribute (with default) for each node. |
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221 Set operations are enabled with NodeDataView, but don't work in |
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222 cases where the data is not hashable. Use with caution. |
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223 Typically, set operations on nodes use NodeView, not NodeDataView. |
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224 That is, they use `G.nodes` instead of `G.nodes(data='foo')`. |
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225 |
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226 Parameters |
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227 ========== |
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228 graph : NetworkX graph-like class |
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229 data : bool or string (default=False) |
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230 default : object (default=None) |
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231 """ |
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232 |
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233 __slots__ = ("_nodes", "_data", "_default") |
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234 |
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235 def __getstate__(self): |
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236 return {"_nodes": self._nodes, "_data": self._data, "_default": self._default} |
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237 |
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238 def __setstate__(self, state): |
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239 self._nodes = state["_nodes"] |
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240 self._data = state["_data"] |
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241 self._default = state["_default"] |
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242 |
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243 def __init__(self, nodedict, data=False, default=None): |
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244 self._nodes = nodedict |
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245 self._data = data |
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246 self._default = default |
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247 |
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248 @classmethod |
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249 def _from_iterable(cls, it): |
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250 try: |
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251 return set(it) |
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252 except TypeError as err: |
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253 if "unhashable" in str(err): |
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254 msg = " : Could be b/c data=True or your values are unhashable" |
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255 raise TypeError(str(err) + msg) from err |
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256 raise |
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257 |
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258 def __len__(self): |
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259 return len(self._nodes) |
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260 |
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261 def __iter__(self): |
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262 data = self._data |
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263 if data is False: |
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264 return iter(self._nodes) |
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265 if data is True: |
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266 return iter(self._nodes.items()) |
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267 return ( |
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268 (n, dd[data] if data in dd else self._default) |
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269 for n, dd in self._nodes.items() |
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270 ) |
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271 |
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272 def __contains__(self, n): |
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273 try: |
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274 node_in = n in self._nodes |
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275 except TypeError: |
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276 n, d = n |
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277 return n in self._nodes and self[n] == d |
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278 if node_in is True: |
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279 return node_in |
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280 try: |
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281 n, d = n |
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282 except (TypeError, ValueError): |
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283 return False |
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284 return n in self._nodes and self[n] == d |
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285 |
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286 def __getitem__(self, n): |
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287 ddict = self._nodes[n] |
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288 data = self._data |
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289 if data is False or data is True: |
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290 return ddict |
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291 return ddict[data] if data in ddict else self._default |
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292 |
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293 def __str__(self): |
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294 return str(list(self)) |
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295 |
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296 def __repr__(self): |
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297 name = self.__class__.__name__ |
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298 if self._data is False: |
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299 return f"{name}({tuple(self)})" |
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300 if self._data is True: |
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301 return f"{name}({dict(self)})" |
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302 return f"{name}({dict(self)}, data={self._data!r})" |
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303 |
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304 |
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305 # DegreeViews |
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306 class DiDegreeView: |
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307 """A View class for degree of nodes in a NetworkX Graph |
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308 |
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309 The functionality is like dict.items() with (node, degree) pairs. |
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310 Additional functionality includes read-only lookup of node degree, |
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311 and calling with optional features nbunch (for only a subset of nodes) |
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312 and weight (use edge weights to compute degree). |
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313 |
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314 Parameters |
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315 ========== |
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316 graph : NetworkX graph-like class |
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317 nbunch : node, container of nodes, or None meaning all nodes (default=None) |
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318 weight : bool or string (default=None) |
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319 |
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320 Notes |
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321 ----- |
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322 DegreeView can still lookup any node even if nbunch is specified. |
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323 |
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324 Examples |
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325 -------- |
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326 >>> G = nx.path_graph(3) |
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327 >>> DV = G.degree() |
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328 >>> assert DV[2] == 1 |
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329 >>> assert sum(deg for n, deg in DV) == 4 |
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330 |
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331 >>> DVweight = G.degree(weight="span") |
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332 >>> G.add_edge(1, 2, span=34) |
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333 >>> DVweight[2] |
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334 34 |
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335 >>> DVweight[0] # default edge weight is 1 |
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336 1 |
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337 >>> sum(span for n, span in DVweight) # sum weighted degrees |
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338 70 |
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339 |
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340 >>> DVnbunch = G.degree(nbunch=(1, 2)) |
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341 >>> assert len(list(DVnbunch)) == 2 # iteration over nbunch only |
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342 """ |
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343 |
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344 def __init__(self, G, nbunch=None, weight=None): |
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345 self._graph = G |
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346 self._succ = G._succ if hasattr(G, "_succ") else G._adj |
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347 self._pred = G._pred if hasattr(G, "_pred") else G._adj |
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348 self._nodes = self._succ if nbunch is None else list(G.nbunch_iter(nbunch)) |
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349 self._weight = weight |
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350 |
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351 def __call__(self, nbunch=None, weight=None): |
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352 if nbunch is None: |
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353 if weight == self._weight: |
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354 return self |
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355 return self.__class__(self._graph, None, weight) |
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356 try: |
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357 if nbunch in self._nodes: |
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358 if weight == self._weight: |
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359 return self[nbunch] |
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360 return self.__class__(self._graph, None, weight)[nbunch] |
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361 except TypeError: |
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362 pass |
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363 return self.__class__(self._graph, nbunch, weight) |
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364 |
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365 def __getitem__(self, n): |
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366 weight = self._weight |
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367 succs = self._succ[n] |
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368 preds = self._pred[n] |
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369 if weight is None: |
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370 return len(succs) + len(preds) |
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371 return sum(dd.get(weight, 1) for dd in succs.values()) + sum( |
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372 dd.get(weight, 1) for dd in preds.values() |
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373 ) |
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374 |
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375 def __iter__(self): |
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376 weight = self._weight |
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377 if weight is None: |
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378 for n in self._nodes: |
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379 succs = self._succ[n] |
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380 preds = self._pred[n] |
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381 yield (n, len(succs) + len(preds)) |
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382 else: |
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383 for n in self._nodes: |
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384 succs = self._succ[n] |
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385 preds = self._pred[n] |
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386 deg = sum(dd.get(weight, 1) for dd in succs.values()) + sum( |
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387 dd.get(weight, 1) for dd in preds.values() |
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388 ) |
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389 yield (n, deg) |
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390 |
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391 def __len__(self): |
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392 return len(self._nodes) |
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393 |
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394 def __str__(self): |
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395 return str(list(self)) |
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396 |
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397 def __repr__(self): |
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398 return f"{self.__class__.__name__}({dict(self)})" |
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399 |
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400 |
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401 class DegreeView(DiDegreeView): |
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402 """A DegreeView class to act as G.degree for a NetworkX Graph |
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403 |
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404 Typical usage focuses on iteration over `(node, degree)` pairs. |
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405 The degree is by default the number of edges incident to the node. |
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406 Optional argument `weight` enables weighted degree using the edge |
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407 attribute named in the `weight` argument. Reporting and iteration |
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408 can also be restricted to a subset of nodes using `nbunch`. |
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409 |
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410 Additional functionality include node lookup so that `G.degree[n]` |
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411 reported the (possibly weighted) degree of node `n`. Calling the |
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412 view creates a view with different arguments `nbunch` or `weight`. |
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413 |
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414 Parameters |
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415 ========== |
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416 graph : NetworkX graph-like class |
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417 nbunch : node, container of nodes, or None meaning all nodes (default=None) |
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418 weight : string or None (default=None) |
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419 |
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420 Notes |
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421 ----- |
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422 DegreeView can still lookup any node even if nbunch is specified. |
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423 |
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424 Examples |
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425 -------- |
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426 >>> G = nx.path_graph(3) |
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427 >>> DV = G.degree() |
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428 >>> assert DV[2] == 1 |
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429 >>> assert G.degree[2] == 1 |
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430 >>> assert sum(deg for n, deg in DV) == 4 |
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431 |
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432 >>> DVweight = G.degree(weight="span") |
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433 >>> G.add_edge(1, 2, span=34) |
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434 >>> DVweight[2] |
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435 34 |
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436 >>> DVweight[0] # default edge weight is 1 |
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437 1 |
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438 >>> sum(span for n, span in DVweight) # sum weighted degrees |
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439 70 |
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440 |
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441 >>> DVnbunch = G.degree(nbunch=(1, 2)) |
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442 >>> assert len(list(DVnbunch)) == 2 # iteration over nbunch only |
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443 """ |
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444 |
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445 def __getitem__(self, n): |
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446 weight = self._weight |
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447 nbrs = self._succ[n] |
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448 if weight is None: |
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449 return len(nbrs) + (n in nbrs) |
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450 return sum(dd.get(weight, 1) for dd in nbrs.values()) + ( |
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451 n in nbrs and nbrs[n].get(weight, 1) |
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452 ) |
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453 |
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454 def __iter__(self): |
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455 weight = self._weight |
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456 if weight is None: |
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457 for n in self._nodes: |
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458 nbrs = self._succ[n] |
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459 yield (n, len(nbrs) + (n in nbrs)) |
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460 else: |
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461 for n in self._nodes: |
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462 nbrs = self._succ[n] |
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463 deg = sum(dd.get(weight, 1) for dd in nbrs.values()) + ( |
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464 n in nbrs and nbrs[n].get(weight, 1) |
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465 ) |
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466 yield (n, deg) |
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467 |
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468 |
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469 class OutDegreeView(DiDegreeView): |
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470 """A DegreeView class to report out_degree for a DiGraph; See DegreeView""" |
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471 |
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472 def __getitem__(self, n): |
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473 weight = self._weight |
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474 nbrs = self._succ[n] |
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475 if self._weight is None: |
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476 return len(nbrs) |
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477 return sum(dd.get(self._weight, 1) for dd in nbrs.values()) |
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478 |
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479 def __iter__(self): |
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480 weight = self._weight |
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481 if weight is None: |
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482 for n in self._nodes: |
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483 succs = self._succ[n] |
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484 yield (n, len(succs)) |
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485 else: |
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486 for n in self._nodes: |
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487 succs = self._succ[n] |
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488 deg = sum(dd.get(weight, 1) for dd in succs.values()) |
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489 yield (n, deg) |
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490 |
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491 |
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492 class InDegreeView(DiDegreeView): |
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493 """A DegreeView class to report in_degree for a DiGraph; See DegreeView""" |
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494 |
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495 def __getitem__(self, n): |
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496 weight = self._weight |
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497 nbrs = self._pred[n] |
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498 if weight is None: |
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499 return len(nbrs) |
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500 return sum(dd.get(weight, 1) for dd in nbrs.values()) |
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501 |
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502 def __iter__(self): |
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503 weight = self._weight |
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504 if weight is None: |
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505 for n in self._nodes: |
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506 preds = self._pred[n] |
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507 yield (n, len(preds)) |
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508 else: |
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509 for n in self._nodes: |
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510 preds = self._pred[n] |
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511 deg = sum(dd.get(weight, 1) for dd in preds.values()) |
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512 yield (n, deg) |
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513 |
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514 |
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515 class MultiDegreeView(DiDegreeView): |
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516 """A DegreeView class for undirected multigraphs; See DegreeView""" |
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517 |
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518 def __getitem__(self, n): |
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519 weight = self._weight |
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520 nbrs = self._succ[n] |
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521 if weight is None: |
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522 return sum(len(keys) for keys in nbrs.values()) + ( |
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523 n in nbrs and len(nbrs[n]) |
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524 ) |
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525 # edge weighted graph - degree is sum of nbr edge weights |
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526 deg = sum( |
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527 d.get(weight, 1) for key_dict in nbrs.values() for d in key_dict.values() |
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528 ) |
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529 if n in nbrs: |
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530 deg += sum(d.get(weight, 1) for d in nbrs[n].values()) |
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531 return deg |
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532 |
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533 def __iter__(self): |
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534 weight = self._weight |
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535 if weight is None: |
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536 for n in self._nodes: |
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537 nbrs = self._succ[n] |
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538 deg = sum(len(keys) for keys in nbrs.values()) + ( |
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539 n in nbrs and len(nbrs[n]) |
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540 ) |
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541 yield (n, deg) |
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542 else: |
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543 for n in self._nodes: |
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544 nbrs = self._succ[n] |
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545 deg = sum( |
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546 d.get(weight, 1) |
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547 for key_dict in nbrs.values() |
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548 for d in key_dict.values() |
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549 ) |
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550 if n in nbrs: |
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551 deg += sum(d.get(weight, 1) for d in nbrs[n].values()) |
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552 yield (n, deg) |
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553 |
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554 |
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555 class DiMultiDegreeView(DiDegreeView): |
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556 """A DegreeView class for MultiDiGraph; See DegreeView""" |
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557 |
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558 def __getitem__(self, n): |
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559 weight = self._weight |
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560 succs = self._succ[n] |
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561 preds = self._pred[n] |
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562 if weight is None: |
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563 return sum(len(keys) for keys in succs.values()) + sum( |
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564 len(keys) for keys in preds.values() |
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565 ) |
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566 # edge weighted graph - degree is sum of nbr edge weights |
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567 deg = sum( |
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568 d.get(weight, 1) for key_dict in succs.values() for d in key_dict.values() |
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569 ) + sum( |
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570 d.get(weight, 1) for key_dict in preds.values() for d in key_dict.values() |
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571 ) |
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572 return deg |
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573 |
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574 def __iter__(self): |
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575 weight = self._weight |
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576 if weight is None: |
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577 for n in self._nodes: |
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578 succs = self._succ[n] |
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579 preds = self._pred[n] |
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580 deg = sum(len(keys) for keys in succs.values()) + sum( |
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581 len(keys) for keys in preds.values() |
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582 ) |
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583 yield (n, deg) |
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584 else: |
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585 for n in self._nodes: |
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586 succs = self._succ[n] |
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587 preds = self._pred[n] |
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588 deg = sum( |
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589 d.get(weight, 1) |
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590 for key_dict in succs.values() |
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591 for d in key_dict.values() |
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592 ) + sum( |
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593 d.get(weight, 1) |
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594 for key_dict in preds.values() |
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595 for d in key_dict.values() |
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596 ) |
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597 yield (n, deg) |
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598 |
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599 |
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600 class InMultiDegreeView(DiDegreeView): |
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601 """A DegreeView class for inward degree of MultiDiGraph; See DegreeView""" |
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602 |
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603 def __getitem__(self, n): |
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604 weight = self._weight |
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605 nbrs = self._pred[n] |
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606 if weight is None: |
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607 return sum(len(data) for data in nbrs.values()) |
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608 # edge weighted graph - degree is sum of nbr edge weights |
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609 return sum( |
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610 d.get(weight, 1) for key_dict in nbrs.values() for d in key_dict.values() |
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611 ) |
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612 |
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613 def __iter__(self): |
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614 weight = self._weight |
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615 if weight is None: |
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616 for n in self._nodes: |
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617 nbrs = self._pred[n] |
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618 deg = sum(len(data) for data in nbrs.values()) |
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619 yield (n, deg) |
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620 else: |
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621 for n in self._nodes: |
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622 nbrs = self._pred[n] |
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623 deg = sum( |
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624 d.get(weight, 1) |
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625 for key_dict in nbrs.values() |
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626 for d in key_dict.values() |
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627 ) |
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628 yield (n, deg) |
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629 |
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630 |
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631 class OutMultiDegreeView(DiDegreeView): |
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632 """A DegreeView class for outward degree of MultiDiGraph; See DegreeView""" |
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633 |
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634 def __getitem__(self, n): |
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635 weight = self._weight |
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636 nbrs = self._succ[n] |
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637 if weight is None: |
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638 return sum(len(data) for data in nbrs.values()) |
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639 # edge weighted graph - degree is sum of nbr edge weights |
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640 return sum( |
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641 d.get(weight, 1) for key_dict in nbrs.values() for d in key_dict.values() |
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642 ) |
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643 |
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644 def __iter__(self): |
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645 weight = self._weight |
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646 if weight is None: |
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647 for n in self._nodes: |
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648 nbrs = self._succ[n] |
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649 deg = sum(len(data) for data in nbrs.values()) |
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650 yield (n, deg) |
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651 else: |
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652 for n in self._nodes: |
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653 nbrs = self._succ[n] |
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654 deg = sum( |
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655 d.get(weight, 1) |
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656 for key_dict in nbrs.values() |
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657 for d in key_dict.values() |
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658 ) |
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659 yield (n, deg) |
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660 |
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661 |
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662 # EdgeDataViews |
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663 class OutEdgeDataView: |
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664 """EdgeDataView for outward edges of DiGraph; See EdgeDataView""" |
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665 |
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666 __slots__ = ( |
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667 "_viewer", |
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668 "_nbunch", |
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669 "_data", |
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670 "_default", |
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671 "_adjdict", |
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672 "_nodes_nbrs", |
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673 "_report", |
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674 ) |
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675 |
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676 def __getstate__(self): |
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677 return { |
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678 "viewer": self._viewer, |
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679 "nbunch": self._nbunch, |
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680 "data": self._data, |
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681 "default": self._default, |
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682 } |
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683 |
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684 def __setstate__(self, state): |
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685 self.__init__(**state) |
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686 |
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687 def __init__(self, viewer, nbunch=None, data=False, default=None): |
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688 self._viewer = viewer |
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689 adjdict = self._adjdict = viewer._adjdict |
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690 if nbunch is None: |
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691 self._nodes_nbrs = adjdict.items |
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692 else: |
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693 # dict retains order of nodes but acts like a set |
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694 nbunch = dict.fromkeys(viewer._graph.nbunch_iter(nbunch)) |
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695 self._nodes_nbrs = lambda: [(n, adjdict[n]) for n in nbunch] |
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696 self._nbunch = nbunch |
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697 self._data = data |
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698 self._default = default |
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699 # Set _report based on data and default |
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700 if data is True: |
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701 self._report = lambda n, nbr, dd: (n, nbr, dd) |
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702 elif data is False: |
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703 self._report = lambda n, nbr, dd: (n, nbr) |
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704 else: # data is attribute name |
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705 self._report = ( |
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706 lambda n, nbr, dd: (n, nbr, dd[data]) |
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707 if data in dd |
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708 else (n, nbr, default) |
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709 ) |
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710 |
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711 def __len__(self): |
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712 return sum(len(nbrs) for n, nbrs in self._nodes_nbrs()) |
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713 |
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714 def __iter__(self): |
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715 return ( |
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716 self._report(n, nbr, dd) |
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717 for n, nbrs in self._nodes_nbrs() |
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718 for nbr, dd in nbrs.items() |
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719 ) |
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720 |
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721 def __contains__(self, e): |
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722 u, v = e[:2] |
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723 if self._nbunch is not None and u not in self._nbunch: |
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724 return False # this edge doesn't start in nbunch |
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725 try: |
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726 ddict = self._adjdict[u][v] |
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727 except KeyError: |
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728 return False |
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729 return e == self._report(u, v, ddict) |
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730 |
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731 def __str__(self): |
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732 return str(list(self)) |
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733 |
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734 def __repr__(self): |
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735 return f"{self.__class__.__name__}({list(self)})" |
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736 |
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737 |
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738 class EdgeDataView(OutEdgeDataView): |
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739 """A EdgeDataView class for edges of Graph |
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740 |
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741 This view is primarily used to iterate over the edges reporting |
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742 edges as node-tuples with edge data optionally reported. The |
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743 argument `nbunch` allows restriction to edges incident to nodes |
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744 in that container/singleton. The default (nbunch=None) |
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745 reports all edges. The arguments `data` and `default` control |
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746 what edge data is reported. The default `data is False` reports |
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747 only node-tuples for each edge. If `data is True` the entire edge |
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748 data dict is returned. Otherwise `data` is assumed to hold the name |
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749 of the edge attribute to report with default `default` if that |
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750 edge attribute is not present. |
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751 |
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752 Parameters |
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753 ---------- |
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754 nbunch : container of nodes, node or None (default None) |
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755 data : False, True or string (default False) |
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756 default : default value (default None) |
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757 |
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758 Examples |
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759 -------- |
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760 >>> G = nx.path_graph(3) |
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761 >>> G.add_edge(1, 2, foo="bar") |
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762 >>> list(G.edges(data="foo", default="biz")) |
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763 [(0, 1, 'biz'), (1, 2, 'bar')] |
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764 >>> assert (0, 1, "biz") in G.edges(data="foo", default="biz") |
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765 """ |
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766 |
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767 __slots__ = () |
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768 |
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769 def __len__(self): |
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770 return sum(1 for e in self) |
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771 |
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772 def __iter__(self): |
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773 seen = {} |
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774 for n, nbrs in self._nodes_nbrs(): |
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775 for nbr, dd in nbrs.items(): |
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776 if nbr not in seen: |
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777 yield self._report(n, nbr, dd) |
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778 seen[n] = 1 |
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779 del seen |
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780 |
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781 def __contains__(self, e): |
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782 u, v = e[:2] |
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783 if self._nbunch is not None and u not in self._nbunch and v not in self._nbunch: |
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784 return False # this edge doesn't start and it doesn't end in nbunch |
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785 try: |
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786 ddict = self._adjdict[u][v] |
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787 except KeyError: |
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788 return False |
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789 return e == self._report(u, v, ddict) |
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790 |
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791 |
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792 class InEdgeDataView(OutEdgeDataView): |
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793 """An EdgeDataView class for outward edges of DiGraph; See EdgeDataView""" |
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parents:
diff
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|
794 |
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|
795 __slots__ = () |
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parents:
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|
796 |
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parents:
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|
797 def __iter__(self): |
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parents:
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|
798 return ( |
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parents:
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|
799 self._report(nbr, n, dd) |
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|
800 for n, nbrs in self._nodes_nbrs() |
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parents:
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|
801 for nbr, dd in nbrs.items() |
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parents:
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|
802 ) |
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parents:
diff
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|
803 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
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|
804 def __contains__(self, e): |
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parents:
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|
805 u, v = e[:2] |
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parents:
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|
806 if self._nbunch is not None and v not in self._nbunch: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
807 return False # this edge doesn't end in nbunch |
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parents:
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|
808 try: |
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parents:
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|
809 ddict = self._adjdict[v][u] |
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parents:
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|
810 except KeyError: |
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|
811 return False |
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parents:
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|
812 return e == self._report(u, v, ddict) |
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parents:
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|
813 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
814 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
815 class OutMultiEdgeDataView(OutEdgeDataView): |
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parents:
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|
816 """An EdgeDataView for outward edges of MultiDiGraph; See EdgeDataView""" |
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|
817 |
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parents:
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|
818 __slots__ = ("keys",) |
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|
819 |
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|
820 def __getstate__(self): |
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|
821 return { |
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822 "viewer": self._viewer, |
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823 "nbunch": self._nbunch, |
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824 "keys": self.keys, |
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825 "data": self._data, |
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826 "default": self._default, |
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827 } |
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|
828 |
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829 def __setstate__(self, state): |
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830 self.__init__(**state) |
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|
831 |
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|
832 def __init__(self, viewer, nbunch=None, data=False, keys=False, default=None): |
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833 self._viewer = viewer |
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834 adjdict = self._adjdict = viewer._adjdict |
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835 self.keys = keys |
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|
836 if nbunch is None: |
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parents:
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837 self._nodes_nbrs = adjdict.items |
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838 else: |
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839 # dict retains order of nodes but acts like a set |
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840 nbunch = dict.fromkeys(viewer._graph.nbunch_iter(nbunch)) |
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parents:
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841 self._nodes_nbrs = lambda: [(n, adjdict[n]) for n in nbunch] |
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|
842 self._nbunch = nbunch |
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parents:
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843 self._data = data |
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844 self._default = default |
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|
845 # Set _report based on data and default |
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|
846 if data is True: |
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|
847 if keys is True: |
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parents:
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|
848 self._report = lambda n, nbr, k, dd: (n, nbr, k, dd) |
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849 else: |
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|
850 self._report = lambda n, nbr, k, dd: (n, nbr, dd) |
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851 elif data is False: |
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852 if keys is True: |
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parents:
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853 self._report = lambda n, nbr, k, dd: (n, nbr, k) |
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|
854 else: |
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parents:
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|
855 self._report = lambda n, nbr, k, dd: (n, nbr) |
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856 else: # data is attribute name |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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|
857 if keys is True: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
858 self._report = ( |
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parents:
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|
859 lambda n, nbr, k, dd: (n, nbr, k, dd[data]) |
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|
860 if data in dd |
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|
861 else (n, nbr, k, default) |
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|
862 ) |
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|
863 else: |
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parents:
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|
864 self._report = ( |
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shellac
parents:
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changeset
|
865 lambda n, nbr, k, dd: (n, nbr, dd[data]) |
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|
866 if data in dd |
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|
867 else (n, nbr, default) |
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parents:
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|
868 ) |
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parents:
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|
869 |
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shellac
parents:
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|
870 def __len__(self): |
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shellac
parents:
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871 return sum(1 for e in self) |
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|
872 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
873 def __iter__(self): |
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parents:
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|
874 return ( |
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shellac
parents:
diff
changeset
|
875 self._report(n, nbr, k, dd) |
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shellac
parents:
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|
876 for n, nbrs in self._nodes_nbrs() |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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|
877 for nbr, kd in nbrs.items() |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
878 for k, dd in kd.items() |
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shellac
parents:
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|
879 ) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
880 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
881 def __contains__(self, e): |
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parents:
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|
882 u, v = e[:2] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
883 if self._nbunch is not None and u not in self._nbunch: |
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shellac
parents:
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|
884 return False # this edge doesn't start in nbunch |
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parents:
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|
885 try: |
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parents:
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|
886 kdict = self._adjdict[u][v] |
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shellac
parents:
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|
887 except KeyError: |
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shellac
parents:
diff
changeset
|
888 return False |
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shellac
parents:
diff
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|
889 if self.keys is True: |
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shellac
parents:
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|
890 k = e[2] |
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|
891 try: |
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parents:
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|
892 dd = kdict[k] |
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parents:
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|
893 except KeyError: |
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parents:
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|
894 return False |
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shellac
parents:
diff
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|
895 return e == self._report(u, v, k, dd) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
896 for k, dd in kdict.items(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
897 if e == self._report(u, v, k, dd): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
898 return True |
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shellac
parents:
diff
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|
899 return False |
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shellac
parents:
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|
900 |
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shellac
parents:
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|
901 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
902 class MultiEdgeDataView(OutMultiEdgeDataView): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
903 """An EdgeDataView class for edges of MultiGraph; See EdgeDataView""" |
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shellac
parents:
diff
changeset
|
904 |
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shellac
parents:
diff
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|
905 __slots__ = () |
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parents:
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|
906 |
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shellac
parents:
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|
907 def __iter__(self): |
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shellac
parents:
diff
changeset
|
908 seen = {} |
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shellac
parents:
diff
changeset
|
909 for n, nbrs in self._nodes_nbrs(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
910 for nbr, kd in nbrs.items(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
911 if nbr not in seen: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
912 for k, dd in kd.items(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
913 yield self._report(n, nbr, k, dd) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
914 seen[n] = 1 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
915 del seen |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
916 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
917 def __contains__(self, e): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
918 u, v = e[:2] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
919 if self._nbunch is not None and u not in self._nbunch and v not in self._nbunch: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
920 return False # this edge doesn't start and doesn't end in nbunch |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
921 try: |
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shellac
parents:
diff
changeset
|
922 kdict = self._adjdict[u][v] |
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parents:
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|
923 except KeyError: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
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|
924 try: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
925 kdict = self._adjdict[v][u] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
926 except KeyError: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
927 return False |
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shellac
parents:
diff
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|
928 if self.keys is True: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
929 k = e[2] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
930 try: |
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parents:
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|
931 dd = kdict[k] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
932 except KeyError: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
933 return False |
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shellac
parents:
diff
changeset
|
934 return e == self._report(u, v, k, dd) |
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shellac
parents:
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changeset
|
935 for k, dd in kdict.items(): |
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shellac
parents:
diff
changeset
|
936 if e == self._report(u, v, k, dd): |
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shellac
parents:
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|
937 return True |
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shellac
parents:
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|
938 return False |
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parents:
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|
939 |
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shellac
parents:
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|
940 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
941 class InMultiEdgeDataView(OutMultiEdgeDataView): |
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shellac
parents:
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|
942 """An EdgeDataView for inward edges of MultiDiGraph; See EdgeDataView""" |
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parents:
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|
943 |
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parents:
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|
944 __slots__ = () |
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parents:
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|
945 |
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shellac
parents:
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changeset
|
946 def __iter__(self): |
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shellac
parents:
diff
changeset
|
947 return ( |
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shellac
parents:
diff
changeset
|
948 self._report(nbr, n, k, dd) |
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shellac
parents:
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changeset
|
949 for n, nbrs in self._nodes_nbrs() |
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shellac
parents:
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|
950 for nbr, kd in nbrs.items() |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
951 for k, dd in kd.items() |
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shellac
parents:
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changeset
|
952 ) |
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shellac
parents:
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|
953 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
954 def __contains__(self, e): |
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shellac
parents:
diff
changeset
|
955 u, v = e[:2] |
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shellac
parents:
diff
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|
956 if self._nbunch is not None and v not in self._nbunch: |
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shellac
parents:
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|
957 return False # this edge doesn't end in nbunch |
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shellac
parents:
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|
958 try: |
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shellac
parents:
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|
959 kdict = self._adjdict[v][u] |
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parents:
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|
960 except KeyError: |
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shellac
parents:
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changeset
|
961 return False |
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shellac
parents:
diff
changeset
|
962 if self.keys is True: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
963 k = e[2] |
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parents:
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|
964 dd = kdict[k] |
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shellac
parents:
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|
965 return e == self._report(u, v, k, dd) |
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shellac
parents:
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changeset
|
966 for k, dd in kdict.items(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
967 if e == self._report(u, v, k, dd): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
968 return True |
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shellac
parents:
diff
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|
969 return False |
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shellac
parents:
diff
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|
970 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
971 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
972 # EdgeViews have set operations and no data reported |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
973 class OutEdgeView(Set, Mapping): |
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shellac
parents:
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changeset
|
974 """A EdgeView class for outward edges of a DiGraph""" |
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shellac
parents:
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|
975 |
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shellac
parents:
diff
changeset
|
976 __slots__ = ("_adjdict", "_graph", "_nodes_nbrs") |
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shellac
parents:
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|
977 |
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shellac
parents:
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changeset
|
978 def __getstate__(self): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
979 return {"_graph": self._graph} |
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shellac
parents:
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|
980 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
981 def __setstate__(self, state): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
982 self._graph = G = state["_graph"] |
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shellac
parents:
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changeset
|
983 self._adjdict = G._succ if hasattr(G, "succ") else G._adj |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
984 self._nodes_nbrs = self._adjdict.items |
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shellac
parents:
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|
985 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
986 @classmethod |
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shellac
parents:
diff
changeset
|
987 def _from_iterable(cls, it): |
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shellac
parents:
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changeset
|
988 return set(it) |
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shellac
parents:
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|
989 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
990 dataview = OutEdgeDataView |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
991 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
992 def __init__(self, G): |
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shellac
parents:
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|
993 self._graph = G |
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shellac
parents:
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|
994 self._adjdict = G._succ if hasattr(G, "succ") else G._adj |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
995 self._nodes_nbrs = self._adjdict.items |
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shellac
parents:
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|
996 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
997 # Set methods |
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shellac
parents:
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changeset
|
998 def __len__(self): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
999 return sum(len(nbrs) for n, nbrs in self._nodes_nbrs()) |
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shellac
parents:
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changeset
|
1000 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1001 def __iter__(self): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1002 for n, nbrs in self._nodes_nbrs(): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1003 for nbr in nbrs: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1004 yield (n, nbr) |
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shellac
parents:
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changeset
|
1005 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1006 def __contains__(self, e): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1007 try: |
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shellac
parents:
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|
1008 u, v = e |
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shellac
parents:
diff
changeset
|
1009 return v in self._adjdict[u] |
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shellac
parents:
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|
1010 except KeyError: |
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shellac
parents:
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changeset
|
1011 return False |
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shellac
parents:
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|
1012 |
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shellac
parents:
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|
1013 # Mapping Methods |
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shellac
parents:
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changeset
|
1014 def __getitem__(self, e): |
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shellac
parents:
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|
1015 u, v = e |
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parents:
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|
1016 return self._adjdict[u][v] |
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parents:
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|
1017 |
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shellac
parents:
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|
1018 # EdgeDataView methods |
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parents:
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|
1019 def __call__(self, nbunch=None, data=False, default=None): |
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shellac
parents:
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|
1020 if nbunch is None and data is False: |
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shellac
parents:
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1021 return self |
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1022 return self.dataview(self, nbunch, data, default) |
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1023 |
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1024 def data(self, data=True, default=None, nbunch=None): |
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1025 if nbunch is None and data is False: |
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1026 return self |
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1027 return self.dataview(self, nbunch, data, default) |
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1028 |
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1029 # String Methods |
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1030 def __str__(self): |
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1031 return str(list(self)) |
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1032 |
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1033 def __repr__(self): |
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1034 return f"{self.__class__.__name__}({list(self)})" |
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1035 |
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1036 |
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1037 class EdgeView(OutEdgeView): |
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1038 """A EdgeView class for edges of a Graph |
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1039 |
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1040 This densely packed View allows iteration over edges, data lookup |
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1041 like a dict and set operations on edges represented by node-tuples. |
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1042 In addition, edge data can be controlled by calling this object |
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1043 possibly creating an EdgeDataView. Typically edges are iterated over |
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1044 and reported as `(u, v)` node tuples or `(u, v, key)` node/key tuples |
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1045 for multigraphs. Those edge representations can also be using to |
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1046 lookup the data dict for any edge. Set operations also are available |
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1047 where those tuples are the elements of the set. |
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1048 Calling this object with optional arguments `data`, `default` and `keys` |
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1049 controls the form of the tuple (see EdgeDataView). Optional argument |
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1050 `nbunch` allows restriction to edges only involving certain nodes. |
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1051 |
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1052 If `data is False` (the default) then iterate over 2-tuples `(u, v)`. |
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1053 If `data is True` iterate over 3-tuples `(u, v, datadict)`. |
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1054 Otherwise iterate over `(u, v, datadict.get(data, default))`. |
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1055 For Multigraphs, if `keys is True`, replace `u, v` with `u, v, key` above. |
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1056 |
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1057 Parameters |
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1058 ========== |
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1059 graph : NetworkX graph-like class |
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1060 nbunch : (default= all nodes in graph) only report edges with these nodes |
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1061 keys : (only for MultiGraph. default=False) report edge key in tuple |
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1062 data : bool or string (default=False) see above |
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1063 default : object (default=None) |
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1064 |
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1065 Examples |
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1066 ======== |
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1067 >>> G = nx.path_graph(4) |
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1068 >>> EV = G.edges() |
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1069 >>> (2, 3) in EV |
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1070 True |
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1071 >>> for u, v in EV: |
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1072 ... print((u, v)) |
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1073 (0, 1) |
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1074 (1, 2) |
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1075 (2, 3) |
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1076 >>> assert EV & {(1, 2), (3, 4)} == {(1, 2)} |
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1077 |
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1078 >>> EVdata = G.edges(data="color", default="aqua") |
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1079 >>> G.add_edge(2, 3, color="blue") |
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1080 >>> assert (2, 3, "blue") in EVdata |
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1081 >>> for u, v, c in EVdata: |
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1082 ... print(f"({u}, {v}) has color: {c}") |
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1083 (0, 1) has color: aqua |
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1084 (1, 2) has color: aqua |
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1085 (2, 3) has color: blue |
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1086 |
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1087 >>> EVnbunch = G.edges(nbunch=2) |
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1088 >>> assert (2, 3) in EVnbunch |
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1089 >>> assert (0, 1) not in EVnbunch |
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1090 >>> for u, v in EVnbunch: |
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1091 ... assert u == 2 or v == 2 |
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1092 |
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1093 >>> MG = nx.path_graph(4, create_using=nx.MultiGraph) |
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1094 >>> EVmulti = MG.edges(keys=True) |
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1095 >>> (2, 3, 0) in EVmulti |
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1096 True |
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1097 >>> (2, 3) in EVmulti # 2-tuples work even when keys is True |
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1098 True |
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1099 >>> key = MG.add_edge(2, 3) |
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1100 >>> for u, v, k in EVmulti: |
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1101 ... print((u, v, k)) |
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1102 (0, 1, 0) |
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1103 (1, 2, 0) |
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1104 (2, 3, 0) |
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1105 (2, 3, 1) |
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1106 """ |
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1107 |
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1108 __slots__ = () |
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1109 |
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1110 dataview = EdgeDataView |
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1111 |
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1112 def __len__(self): |
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1113 num_nbrs = (len(nbrs) + (n in nbrs) for n, nbrs in self._nodes_nbrs()) |
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1114 return sum(num_nbrs) // 2 |
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1115 |
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1116 def __iter__(self): |
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1117 seen = {} |
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1118 for n, nbrs in self._nodes_nbrs(): |
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1119 for nbr in list(nbrs): |
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1120 if nbr not in seen: |
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1121 yield (n, nbr) |
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1122 seen[n] = 1 |
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1123 del seen |
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1124 |
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1125 def __contains__(self, e): |
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1126 try: |
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1127 u, v = e[:2] |
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1128 return v in self._adjdict[u] or u in self._adjdict[v] |
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1129 except (KeyError, ValueError): |
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1130 return False |
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1131 |
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1132 |
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1133 class InEdgeView(OutEdgeView): |
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1134 """A EdgeView class for inward edges of a DiGraph""" |
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1135 |
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1136 __slots__ = () |
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1137 |
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1138 def __setstate__(self, state): |
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1139 self._graph = G = state["_graph"] |
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1140 self._adjdict = G._pred if hasattr(G, "pred") else G._adj |
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1141 self._nodes_nbrs = self._adjdict.items |
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1142 |
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1143 dataview = InEdgeDataView |
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1144 |
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1145 def __init__(self, G): |
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1146 self._graph = G |
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1147 self._adjdict = G._pred if hasattr(G, "pred") else G._adj |
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1148 self._nodes_nbrs = self._adjdict.items |
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1149 |
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1150 def __iter__(self): |
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1151 for n, nbrs in self._nodes_nbrs(): |
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1152 for nbr in nbrs: |
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1153 yield (nbr, n) |
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1154 |
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1155 def __contains__(self, e): |
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1156 try: |
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1157 u, v = e |
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1158 return u in self._adjdict[v] |
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1159 except KeyError: |
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1160 return False |
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1161 |
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1162 def __getitem__(self, e): |
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1163 u, v = e |
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1164 return self._adjdict[v][u] |
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1165 |
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1166 |
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1167 class OutMultiEdgeView(OutEdgeView): |
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1168 """A EdgeView class for outward edges of a MultiDiGraph""" |
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1169 |
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1170 __slots__ = () |
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1171 |
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1172 dataview = OutMultiEdgeDataView |
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1173 |
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1174 def __len__(self): |
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1175 return sum( |
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1176 len(kdict) for n, nbrs in self._nodes_nbrs() for nbr, kdict in nbrs.items() |
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1177 ) |
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1178 |
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1179 def __iter__(self): |
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1180 for n, nbrs in self._nodes_nbrs(): |
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1181 for nbr, kdict in nbrs.items(): |
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1182 for key in kdict: |
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1183 yield (n, nbr, key) |
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1184 |
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1185 def __contains__(self, e): |
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1186 N = len(e) |
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1187 if N == 3: |
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1188 u, v, k = e |
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1189 elif N == 2: |
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1190 u, v = e |
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1191 k = 0 |
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1192 else: |
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1193 raise ValueError("MultiEdge must have length 2 or 3") |
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1194 try: |
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1195 return k in self._adjdict[u][v] |
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1196 except KeyError: |
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1197 return False |
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1198 |
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1199 def __getitem__(self, e): |
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1200 u, v, k = e |
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1201 return self._adjdict[u][v][k] |
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1202 |
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1203 def __call__(self, nbunch=None, data=False, keys=False, default=None): |
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1204 if nbunch is None and data is False and keys is True: |
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1205 return self |
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1206 return self.dataview(self, nbunch, data, keys, default) |
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1207 |
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1208 def data(self, data=True, keys=False, default=None, nbunch=None): |
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1209 if nbunch is None and data is False and keys is True: |
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1210 return self |
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1211 return self.dataview(self, nbunch, data, keys, default) |
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1212 |
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1213 |
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1214 class MultiEdgeView(OutMultiEdgeView): |
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1215 """A EdgeView class for edges of a MultiGraph""" |
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1216 |
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1217 __slots__ = () |
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1218 |
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1219 dataview = MultiEdgeDataView |
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1220 |
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1221 def __len__(self): |
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1222 return sum(1 for e in self) |
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1223 |
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1224 def __iter__(self): |
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1225 seen = {} |
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1226 for n, nbrs in self._nodes_nbrs(): |
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1227 for nbr, kd in nbrs.items(): |
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1228 if nbr not in seen: |
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1229 for k, dd in kd.items(): |
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1230 yield (n, nbr, k) |
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1231 seen[n] = 1 |
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1232 del seen |
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1233 |
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1234 |
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1235 class InMultiEdgeView(OutMultiEdgeView): |
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1236 """A EdgeView class for inward edges of a MultiDiGraph""" |
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1237 |
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1238 __slots__ = () |
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1239 |
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1240 def __setstate__(self, state): |
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1241 self._graph = G = state["_graph"] |
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1242 self._adjdict = G._pred if hasattr(G, "pred") else G._adj |
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1243 self._nodes_nbrs = self._adjdict.items |
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1244 |
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1245 dataview = InMultiEdgeDataView |
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1246 |
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1247 def __init__(self, G): |
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1248 self._graph = G |
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1249 self._adjdict = G._pred if hasattr(G, "pred") else G._adj |
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1250 self._nodes_nbrs = self._adjdict.items |
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1251 |
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1252 def __iter__(self): |
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1253 for n, nbrs in self._nodes_nbrs(): |
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1254 for nbr, kdict in nbrs.items(): |
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1255 for key in kdict: |
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1256 yield (nbr, n, key) |
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1257 |
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1258 def __contains__(self, e): |
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1259 N = len(e) |
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1260 if N == 3: |
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1261 u, v, k = e |
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1262 elif N == 2: |
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1263 u, v = e |
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1264 k = 0 |
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1265 else: |
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1266 raise ValueError("MultiEdge must have length 2 or 3") |
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1267 try: |
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1268 return k in self._adjdict[v][u] |
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1269 except KeyError: |
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1270 return False |
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1271 |
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1272 def __getitem__(self, e): |
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1273 u, v, k = e |
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1274 return self._adjdict[v][u][k] |