File Content: _abc.py import abc from collections.abc import Mapping, MutableMapping class MultiMapping(Mapping): @abc.abstractmethod def getall(self, key, default=None): raise KeyError @abc.abstractmethod def getone(self, key, default=None): raise KeyError class MutableMultiMapping(MultiMapping, MutableMapping): @abc.abstractmethod def add(self, key, value): raise NotImplementedError @abc.abstractmethod def extend(self, *args, **kwargs): raise NotImplementedError @abc.abstractmethod def popone(self, key, default=None): raise KeyError @abc.abstractmethod def popall(self, key, default=None): raise KeyError Submit