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34 lines
862 B
34 lines
862 B
3 years ago
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# -*- coding: utf-8 -*-
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# Copyright 2009-2021 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 typing-related objects."""
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import typing as _t
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KT = _t.TypeVar('KT')
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VT = _t.TypeVar('VT')
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IterItems = _t.Iterable[_t.Tuple[KT, VT]]
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MapOrIterItems = _t.Union[_t.Mapping[KT, VT], IterItems[KT, VT]]
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DT = _t.TypeVar('DT') #: for default arguments
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VDT = _t.Union[VT, DT]
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class _BareReprMeta(type):
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def __repr__(cls) -> str:
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return f'<{cls.__name__}>'
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class _NONE(metaclass=_BareReprMeta):
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"""Sentinel type used to represent 'missing'."""
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OKT = _t.Union[KT, _NONE] #: optional key type
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OVT = _t.Union[VT, _NONE] #: optional value type
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