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from collections import MutableMapping
class LimitedDict(MutableMapping):
def __init__(self, args=None, **kwargs):
keys = kwargs.pop('keys', [])
self.__keys = keys
self.__data = {}
if args:
kwargs.update((key, val) for key, val in args)
for key, val in kwargs.items():
self[key] = val
def __setitem__(self, key, val):
if key not in self.__keys:
raise KeyError("Illegal key: {}".format(key))
self.__data[key] = val
def __getitem__(self, key):
return self.__data[key]
def __iter__(self):
return self.__data.__iter__()
def __delitem__(self, key):
del self.__data[key]
def __len__(self):
return len(self.__data)
def __repr__(self):
return "{}({}, {})".format(self.__class__.__name__, self.defined_keys, self.__data)
@property
def defined_keys(self):
return self.__keys
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