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52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2022
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains helper functions related to enums.
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Warning:
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Contents of this module are intended to be used internally by the library and *not* by the
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user. Changes to this module are not considered breaking changes and may not be documented in
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the changelog.
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"""
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from enum import Enum
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from typing import Type, TypeVar, Union
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_A = TypeVar("_A")
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_B = TypeVar("_B")
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_Enum = TypeVar("_Enum", bound=Enum)
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def get_member(enum: Type[_Enum], value: _A, default: _B) -> Union[_Enum, _A, _B]:
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"""Tries to call ``enum(value)`` to convert the value into an enumeration member.
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If that fails, the ``default`` is returned.
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"""
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try:
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return enum(value)
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except ValueError:
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return default
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class StringEnum(str, Enum):
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"""Helper class for string enums where the value is not important to be displayed on
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stringification.
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"""
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__slots__ = ()
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__}.{self.name}>"
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