Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/humanfriendly/decorators.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Human friendly input/output in Python. |
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2 # |
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3 # Author: Peter Odding <peter@peterodding.com> |
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4 # Last Change: March 2, 2020 |
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5 # URL: https://humanfriendly.readthedocs.io |
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6 |
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7 """Simple function decorators to make Python programming easier.""" |
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8 |
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9 # Standard library modules. |
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10 import functools |
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11 |
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12 # Public identifiers that require documentation. |
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13 __all__ = ('RESULTS_ATTRIBUTE', 'cached') |
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14 |
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15 RESULTS_ATTRIBUTE = 'cached_results' |
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16 """The name of the property used to cache the return values of functions (a string).""" |
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17 |
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18 |
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19 def cached(function): |
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20 """ |
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21 Rudimentary caching decorator for functions. |
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22 |
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23 :param function: The function whose return value should be cached. |
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24 :returns: The decorated function. |
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25 |
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26 The given function will only be called once, the first time the wrapper |
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27 function is called. The return value is cached by the wrapper function as |
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28 an attribute of the given function and returned on each subsequent call. |
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29 |
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30 .. note:: Currently no function arguments are supported because only a |
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31 single return value can be cached. Accepting any function |
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32 arguments at all would imply that the cache is parametrized on |
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33 function arguments, which is not currently the case. |
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34 """ |
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35 @functools.wraps(function) |
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36 def wrapper(): |
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37 try: |
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38 return getattr(wrapper, RESULTS_ATTRIBUTE) |
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39 except AttributeError: |
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40 result = function() |
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41 setattr(wrapper, RESULTS_ATTRIBUTE, result) |
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42 return result |
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43 return wrapper |