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$ lad*j"Tځz@ؔţ N Ŀ ? """Utilities for with-statement contexts. See PEP 343.""" import abc import sys import _collections_abc from collections import deque from functools import wraps from types import MethodType, GenericAlias __all__ = ["asynccontextmanager", "contextmanager", "closing", "nullcontext", "AbstractContextManager", "AbstractAsyncContextManager", "AsyncExitStack", "ContextDecorator", "ExitStack", "redirect_stdout", "redirect_stderr", "suppress"] class AbstractContextManager(abc.ABC): """An abstract base class for context managers.""" __class_getitem__ = classmethod(GenericAlias) def __enter__(self): """Return `self` upon entering the runtime context.""" return self @abc.abstractmethod def __exit__(self, exc_type, exc_value, traceback): """Raise any exception triggered within the runtime context.""" return None @classmethod def __subclasshook__(cls, C): if cls is AbstractContextManager: return _collections_abc._check_methods(C, "__enter__", "__exit__") return NotImplemented class AbstractAsyncContextManager(abc.ABC): """An abstract base class for asynchronous context managers.""" __class_getitem__ = classmethod(GenericAlias) async def __aenter__(self): """Return `self` upon entering the runtime context.""" return self @abc.abstractmethod async def __aexit__(self, exc_type, exc_value, traceback): """Raise any exception triggered within the runtime context.""" return None @classmethod def __subclasshook__(cls, C): if cls is AbstractAsyncContextManager: return _collections_abc._check_methods(C, "__aenter__", "__aexit__") return NotImplemented class ContextDecorator(object): "A base class or mixin that enables context managers to work as decorators." def _recreate_cm(self): """Return a recreated instance of self. Allows an otherwise one-shot context manager like _GeneratorContextManager to support use as a decorator via implicit recreation. This is a private interface just for _GeneratorContextManager. See issue #11647 for details. """ return self def __call__(self, func): @wraps(func) def inner(*args, **kwds): with self._recreate_cm(): return func(*args, **kwds) return inner class _GeneratorContextManagerBase: """Shared functionality for @contextmanager and @asynccontextmanager.""" def __init__(self, func, args, kwds): self.gen = func(*args, **kwds) self.func, self.args, self.kwds = func, args, kwds # Issue 19330: ensure context manager instances have good docstrings doc = getattr(func, "__doc__", None) if