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bpo-36772 Allow lru_cache to be used as decorator without making a function call (GH-13048)

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Raymond Hettinger 2019-05-26 11:27:35 -07:00 • committed by GitHub
parent aaf47caf35
commit b821868e6d
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5 changed files with 53 additions and 12 deletions
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12
Lib/functools.py
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@ -518,14 +518,18 @@ def lru_cache(maxsize=128, typed=False):
# The internals of the lru_cache are encapsulated for thread safety and
# to allow the implementation to change (including a possible C version).
# Early detection of an erroneous call to @lru_cache without any arguments
# resulting in the inner function being passed to maxsize instead of an
# integer or None. Negative maxsize is treated as 0.
if isinstance(maxsize, int):
# Negative maxsize is treated as 0
if maxsize < 0:
maxsize = 0
elif callable(maxsize) and isinstance(typed, bool):
# The user_function was passed in directly via the maxsize argument
user_function, maxsize = maxsize, 128
wrapper = _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo)
return update_wrapper(wrapper, user_function)
elif maxsize is not None:
raise TypeError('Expected maxsize to be an integer or None')
raise TypeError(
'Expected first argument to be an integer, a callable, or None')
def decorating_function(user_function):
wrapper = _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo)