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from typing import ( ChainMap, MutableMapping, TypeVar, cast, ) _KT = TypeVar("_KT") _VT = TypeVar("_VT") class DeepChainMap(ChainMap[_KT, _VT]): """ Variant of ChainMap that allows direct updates to inner scopes. Only works when all passed mapping are mutable. """ def __setitem__(self, key: _KT, value: _VT) -> None: for mapping in self.maps: mutable_mapping = cast(MutableMapping[_KT, _VT], mapping) if key in mutable_mapping: mutable_mapping[key] = value return cast(MutableMapping[_KT, _VT], self.maps[0])[key] = value def __delitem__(self, key: _KT) -> None: """ Raises ------ KeyError If `key` doesn't exist. """ for mapping in self.maps: mutable_mapping = cast(MutableMapping[_KT, _VT], mapping) if key in mapping: del mutable_mapping[key] return raise KeyError(key)
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