| """Auxiliary definitions used in type annotations. |
| """ |
| |
| # Copyright The Mbed TLS Contributors |
| # SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| # |
| |
| from typing import Any |
| |
| # The typing_extensions module is necessary for type annotations that are |
| # checked with mypy. It is only used for type annotations or to define |
| # things that are themselves only used for type annotations. It is not |
| # available on a default Python installation. Therefore, try loading |
| # what we need from it for the sake of mypy (which depends on, or comes |
| # with, typing_extensions), and if not define substitutes that lack the |
| # static type information but are good enough at runtime. |
| try: |
| from typing_extensions import Protocol #pylint: disable=import-error |
| except ImportError: |
| class Protocol: #type: ignore |
| #pylint: disable=too-few-public-methods |
| pass |
| |
| class Writable(Protocol): |
| """Abstract class for typing hints.""" |
| # pylint: disable=no-self-use,too-few-public-methods,unused-argument |
| def write(self, text: str) -> Any: |
| ... |