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from abc import abstractmethod
from collections.abc import MutableMapping
class DefaultMapping(MutableMapping):
__slots__ = ()
@abstractmethod
def __contains__(self, key): # pragma: nocover
return False
@abstractmethod
def __getitem__(self, key): # pragma: nocover
if hasattr(self.__class__, '__missing__'):
return self.__class__.__missing__(self, key)
else:
raise KeyError(key)
def get(self, key, default=None):
if key in self:
return self[key]
else:
return default
__marker = object()
def pop(self, key, default=__marker):
if key in self:
value = self[key]
del self[key]
elif default is self.__marker:
raise KeyError(key)
else:
value = default
return value
def setdefault(self, key, default=None):
if key in self:
value = self[key]
else:
self[key] = value = default
return value
DefaultMapping.register(dict)
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