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| from __future__ import annotations | |
| import sys | |
| from contextlib import AbstractContextManager | |
| from types import TracebackType | |
| from typing import TYPE_CHECKING, Optional, Type, cast | |
| if sys.version_info < (3, 11): | |
| from ._exceptions import BaseExceptionGroup | |
| if TYPE_CHECKING: | |
| # requires python 3.9 | |
| BaseClass = AbstractContextManager[None] | |
| else: | |
| BaseClass = AbstractContextManager | |
| class suppress(BaseClass): | |
| """Backport of :class:`contextlib.suppress` from Python 3.12.1.""" | |
| def __init__(self, *exceptions: type[BaseException]): | |
| self._exceptions = exceptions | |
| def __enter__(self) -> None: | |
| pass | |
| def __exit__( | |
| self, | |
| exctype: Optional[Type[BaseException]], | |
| excinst: Optional[BaseException], | |
| exctb: Optional[TracebackType], | |
| ) -> bool: | |
| # Unlike isinstance and issubclass, CPython exception handling | |
| # currently only looks at the concrete type hierarchy (ignoring | |
| # the instance and subclass checking hooks). While Guido considers | |
| # that a bug rather than a feature, it's a fairly hard one to fix | |
| # due to various internal implementation details. suppress provides | |
| # the simpler issubclass based semantics, rather than trying to | |
| # exactly reproduce the limitations of the CPython interpreter. | |
| # | |
| # See http://bugs.python.org/issue12029 for more details | |
| if exctype is None: | |
| return False | |
| if issubclass(exctype, self._exceptions): | |
| return True | |
| if issubclass(exctype, BaseExceptionGroup): | |
| match, rest = cast(BaseExceptionGroup, excinst).split(self._exceptions) | |
| if rest is None: | |
| return True | |
| raise rest | |
| return False | |