New submission from Brian Lee <brian.kihoon....@gmail.com>:
This seems like unexpected behavior: Two keys that are equal and have equal hashes should yield cache hits, but they do not. Python 3.9.6 (default, Aug 18 2021, 19:38:01) [GCC 7.5.0] :: Anaconda, Inc. on linux Type "help", "copyright", "credits" or "license" for more information. >>> import functools >>> >>> import numpy as np >>> >>> @functools.lru_cache(maxsize=None) ... def f(x): ... return x ... >>> py_str = 'hello world' >>> np_str = np.str_(py_str) >>> >>> assert py_str == np_str >>> assert hash(py_str) == hash(np_str) >>> >>> assert f.cache_info().currsize == 0 >>> f(py_str) 'hello world' >>> assert f.cache_info().currsize == 1 >>> f(np_str) 'hello world' >>> assert f.cache_info().currsize == 2 >>> print(f.cache_info()) CacheInfo(hits=0, misses=2, maxsize=None, currsize=2) ---------- components: Library (Lib) messages: 400209 nosy: brilee priority: normal severity: normal status: open title: functools.lru_cache does not consider strings and numpy strings as equivalent versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44992> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
