diff options
Diffstat (limited to 'Lib/functools.py')
-rw-r--r-- | Lib/functools.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/functools.py b/Lib/functools.py index 4538057..c1ca850 100644 --- a/Lib/functools.py +++ b/Lib/functools.py @@ -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 |