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