def __init__(self, d={}, normalize=str.lower, base_factory=dict):
self.normalize = normalize
self._d = base_factory()
self._k = {}
if isinstance(d, abc.Mapping):
for k, v in d.items():
self.__setitem__(k, v)
elif isinstance(d, abc.Iterable):
for (k, v) in d:
self.__setitem__(k, v)
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