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40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
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"""Auxiliary definitions used in type annotations.
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"""
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Any
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# The typing_extensions module is necessary for type annotations that are
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# checked with mypy. It is only used for type annotations or to define
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# things that are themselves only used for type annotations. It is not
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# available on a default Python installation. Therefore, try loading
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# what we need from it for the sake of mypy (which depends on, or comes
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# with, typing_extensions), and if not define substitutes that lack the
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# static type information but are good enough at runtime.
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try:
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from typing_extensions import Protocol #pylint: disable=import-error
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except ImportError:
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class Protocol: #type: ignore
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#pylint: disable=too-few-public-methods
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pass
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class Writable(Protocol):
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"""Abstract class for typing hints."""
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# pylint: disable=no-self-use,too-few-public-methods,unused-argument
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def write(self, text: str) -> Any:
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...
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