| Current Path : /proc/thread-self/root/usr/local/lib/python3.8/dist-packages/cachetools/ |
Linux ift1.ift-informatik.de 5.4.0-216-generic #236-Ubuntu SMP Fri Apr 11 19:53:21 UTC 2025 x86_64 |
| Current File : //proc/thread-self/root/usr/local/lib/python3.8/dist-packages/cachetools/lfu.py |
import collections
from .cache import Cache
class LFUCache(Cache):
"""Least Frequently Used (LFU) cache implementation."""
def __init__(self, maxsize, getsizeof=None):
Cache.__init__(self, maxsize, getsizeof)
self.__counter = collections.Counter()
def __getitem__(self, key, cache_getitem=Cache.__getitem__):
value = cache_getitem(self, key)
if key in self: # __missing__ may not store item
self.__counter[key] -= 1
return value
def __setitem__(self, key, value, cache_setitem=Cache.__setitem__):
cache_setitem(self, key, value)
self.__counter[key] -= 1
def __delitem__(self, key, cache_delitem=Cache.__delitem__):
cache_delitem(self, key)
del self.__counter[key]
def popitem(self):
"""Remove and return the `(key, value)` pair least frequently used."""
try:
(key, _), = self.__counter.most_common(1)
except ValueError:
raise KeyError('%s is empty' % type(self).__name__) from None
else:
return (key, self.pop(key))