Source code for bidict._frozen

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# Copyright 2018 Joshua Bronson. All Rights Reserved.
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"""Provides :class:`frozenbidict`, an immutable, hashable bidirectional mapping type."""

from ._base import BidictBase
from ._proxied import _ProxiedKeysValsItems
from .compat import ItemsView


[docs]class frozenbidict(_ProxiedKeysValsItems, BidictBase): # noqa: N801; pylint: disable=invalid-name """Immutable, hashable bidict type.""" __slots__ = ()
[docs] def __hash__(self): # lgtm [py/equals-hash-mismatch] """The hash of this bidict as determined by its items.""" if getattr(self, '_hash', None) is None: # pylint: disable=protected-access,attribute-defined-outside-init self._hash = ItemsView(self)._hash() return self._hash
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