24 lines
632 B
Python
24 lines
632 B
Python
from collections import ChainMap
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class DeepChainMap(ChainMap):
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def __setitem__(self, key, value):
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for mapping in self.maps:
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if key in mapping:
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mapping[key] = value
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return
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self.maps[0][key] = value
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def __delitem__(self, key):
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for mapping in self.maps:
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if key in mapping:
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del mapping[key]
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return
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raise KeyError(key)
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# override because the m parameter is introduced in Python 3.4
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def new_child(self, m=None):
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if m is None:
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m = {}
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return self.__class__(m, *self.maps)
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