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Issue 22184: Early detection and reporting of missing lru_cache parameters

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This commit is contained in:
Raymond Hettinger 2014-08-12 12:44:52 -07:00
parent 4d83192ea0
commit 4d58897fdb
3 changed files with 16 additions and 0 deletions
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6
Lib/functools.py
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@ -392,6 +392,12 @@ 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.
if maxsize is not None and not isinstance(maxsize, int):
raise TypeError('Expected maxsize to be an integer or None')
# Constants shared by all lru cache instances:
sentinel = object() # unique object used to signal cache misses
make_key = _make_key # build a key from the function arguments