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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
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