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dS ) z>Provide the :class:`BidirectionalMapping` abstract base class.� )� annotationsN)�abstractmethod� )�KT)�VTc �F � e Zd ZdZdZeed d�� � � � Zd
d�ZdS ) �BidirectionalMappingaE Abstract base class for bidirectional mapping types.
Extends :class:`collections.abc.Mapping` primarily by adding the
(abstract) :attr:`inverse` property,
which implementers of :class:`BidirectionalMapping`
should override to return a reference to the inverse
:class:`BidirectionalMapping` instance.
� �return� BidirectionalMapping[VT, KT]c � � t �)z�The inverse of this bidirectional mapping instance.
*See also* :attr:`bidict.BidictBase.inverse`, :attr:`bidict.BidictBase.inv`
:raises NotImplementedError: Meant to be overridden in subclasses.
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� � "�!� �t.Iterator[tuple[VT, KT]]c �N � t | j � � � � � S )a Get an iterator over the items in :attr:`inverse`.
This is functionally equivalent to iterating over the items in the
forward mapping and inverting each one on the fly, but this provides a
more efficient implementation: Assuming the already-inverted items
are stored in :attr:`inverse`, just return an iterator over them directly.
Providing this default implementation enables external functions,
particularly :func:`~bidict.inverted`, to use this optimized
implementation when available, instead of having to invert on the fly.
*See also* :func:`bidict.inverted`
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