matteo-the-prestige/matteo_env/Lib/site-packages/bidict/_delegating.py

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# -*- coding: utf-8 -*-
# Copyright 2009-2020 Joshua Bronson. All Rights Reserved.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
"""Provide :class:`_DelegatingBidict`."""
import typing as _t
from ._base import BidictBase
from ._typing import KT, VT
class _DelegatingBidict(BidictBase[KT, VT]):
"""Provide optimized implementations of several methods by delegating to backing dicts.
Used to override less efficient implementations inherited by :class:`~collections.abc.Mapping`.
"""
__slots__ = ()
def __iter__(self) -> _t.Iterator[KT]:
"""Iterator over the contained keys."""
return iter(self._fwdm)
def keys(self) -> _t.KeysView[KT]:
"""A set-like object providing a view on the contained keys."""
return self._fwdm.keys()
def values(self) -> _t.KeysView[VT]: # type: ignore # https://github.com/python/typeshed/issues/4435
"""A set-like object providing a view on the contained values."""
return self._invm.keys()
def items(self) -> _t.ItemsView[KT, VT]:
"""A set-like object providing a view on the contained items."""
return self._fwdm.items()