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# -*- coding: utf-8 -*-
"""Read and write to a dict-like cache."""
from collections import MutableMapping
class IMCache(MutableMapping):
"""Read and write to a dict-like cache."""
MAXLEN = 1000
def __init__(self, maxlen=MAXLEN, *a, **k):
self.filepath = 'IN MEMORY'
self.maxlen = maxlen
self.d = dict(*a, **k)
while len(self) > maxlen: # pragma: no cache
self.popitem()
def __iter__(self):
return iter(self.d)
def __len__(self):
return len(self.d)
def __getitem__(self, k):
return self.d[k]
def __setitem__(self, k, v):
if k not in self and len(self) == self.maxlen:
self.popitem()
self.d[k] = v
def __delitem__(self, k):
del self.d[k]
def __bool__(self):
return len(self) != 0
# For PY2 compatibility
__nonzero__ = __bool__
def __call__(self, k):
try:
return self.__getitem__(k)
except KeyError:
return None
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