diff --git a/lib/contextlib2/__init__.py b/lib/contextlib2/__init__.py deleted file mode 100644 index d6c0c4ac..00000000 --- a/lib/contextlib2/__init__.py +++ /dev/null @@ -1,798 +0,0 @@ -"""contextlib2 - backports and enhancements to the contextlib module""" - -import abc -import sys -import warnings -import _collections_abc -from collections import deque -from functools import wraps -from types import MethodType - -# Python 3.6/3.7/3.8 compatibility: GenericAlias may not be defined -try: - from types import GenericAlias -except ImportError: - # If the real GenericAlias type doesn't exist, __class_getitem__ won't be used, - # so the fallback placeholder doesn't need to provide any meaningful behaviour - class GenericAlias: - pass - - -__all__ = ["asynccontextmanager", "contextmanager", "closing", "nullcontext", - "AbstractContextManager", "AbstractAsyncContextManager", - "AsyncExitStack", "ContextDecorator", "ExitStack", - "redirect_stdout", "redirect_stderr", "suppress", "aclosing"] - -# Backwards compatibility -__all__ += ["ContextStack"] - -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 refresh_cm(self): - """Returns the context manager used to actually wrap the call to the - decorated function. - - The default implementation just returns *self*. - - Overriding this method allows otherwise one-shot context managers - like _GeneratorContextManager to support use as decorators via - implicit recreation. - - DEPRECATED: refresh_cm was never added to the standard library's - ContextDecorator API - """ - warnings.warn("refresh_cm was never added to the standard library", - DeprecationWarning) - return self._recreate_cm() - - 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 AsyncContextDecorator(object): - "A base class or mixin that enables async context managers to work as decorators." - - def _recreate_cm(self): - """Return a recreated instance of self. - """ - return self - - def __call__(self, func): - @wraps(func) - async def inner(*args, **kwds): - async with self._recreate_cm(): - return await 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 doc is None: - doc = type(self).__doc__ - self.__doc__ = doc - # Unfortunately, this still doesn't provide good help output when - # inspecting the created context manager instances, since pydoc - # currently bypasses the instance docstring and shows the docstring - # for the class instead. - # See http://bugs.python.org/issue19404 for more details. - - -class _GeneratorContextManager(_GeneratorContextManagerBase, - AbstractContextManager, - ContextDecorator): - """Helper for @contextmanager decorator.""" - - def _recreate_cm(self): - # _GCM instances are one-shot context managers, so the - # CM must be recreated each time a decorated function is - # called - return self.__class__(self.func, self.args, self.kwds) - - def __enter__(self): - # do not keep args and kwds alive unnecessarily - # they are only needed for recreation, which is not possible anymore - del self.args, self.kwds, self.func - try: - return next(self.gen) - except StopIteration: - raise RuntimeError("generator didn't yield") from None - - def __exit__(self, type, value, traceback): - if type is None: - try: - next(self.gen) - except StopIteration: - return False - else: - raise RuntimeError("generator didn't stop") - else: - if value is None: - # Need to force instantiation so we can reliably - # tell if we get the same exception back - value = type() - try: - self.gen.throw(type, value, traceback) - except StopIteration as exc: - # Suppress StopIteration *unless* it's the same exception that - # was passed to throw(). This prevents a StopIteration - # raised inside the "with" statement from being suppressed. - return exc is not value - except RuntimeError as exc: - # Don't re-raise the passed in exception. (issue27122) - if exc is value: - return False - # Likewise, avoid suppressing if a StopIteration exception - # was passed to throw() and later wrapped into a RuntimeError - # (see PEP 479). - if type is StopIteration and exc.__cause__ is value: - return False - raise - except: - # only re-raise if it's *not* the exception that was - # passed to throw(), because __exit__() must not raise - # an exception unless __exit__() itself failed. But throw() - # has to raise the exception to signal propagation, so this - # fixes the impedance mismatch between the throw() protocol - # and the __exit__() protocol. - # - # This cannot use 'except BaseException as exc' (as in the - # async implementation) to maintain compatibility with - # Python 2, where old-style class exceptions are not caught - # by 'except BaseException'. - if sys.exc_info()[1] is value: - return False - raise - raise RuntimeError("generator didn't stop after throw()") - - -class _AsyncGeneratorContextManager(_GeneratorContextManagerBase, - AbstractAsyncContextManager, - AsyncContextDecorator): - """Helper for @asynccontextmanager.""" - - def _recreate_cm(self): - # _AGCM instances are one-shot context managers, so the - # ACM must be recreated each time a decorated function is - # called - return self.__class__(self.func, self.args, self.kwds) - - async def __aenter__(self): - try: - return await self.gen.__anext__() - except StopAsyncIteration: - raise RuntimeError("generator didn't yield") from None - - async def __aexit__(self, typ, value, traceback): - if typ is None: - try: - await self.gen.__anext__() - except StopAsyncIteration: - return - else: - raise RuntimeError("generator didn't stop") - else: - if value is None: - value = typ() - # See _GeneratorContextManager.__exit__ for comments on subtleties - # in this implementation - try: - await self.gen.athrow(typ, value, traceback) - raise RuntimeError("generator didn't stop after athrow()") - except StopAsyncIteration as exc: - return exc is not value - except RuntimeError as exc: - if exc is value: - return False - # Avoid suppressing if a StopIteration exception - # was passed to throw() and later wrapped into a RuntimeError - # (see PEP 479 for sync generators; async generators also - # have this behavior). But do this only if the exception wrapped - # by the RuntimeError is actually Stop(Async)Iteration (see - # issue29692). - if isinstance(value, (StopIteration, StopAsyncIteration)): - if exc.__cause__ is value: - return False - raise - except BaseException as exc: - if exc is not value: - raise - - -def contextmanager(func): - """@contextmanager decorator. - - Typical usage: - - @contextmanager - def some_generator(): - - try: - yield - finally: - - - This makes this: - - with some_generator() as : - - - equivalent to this: - - - try: - = - - finally: - - """ - @wraps(func) - def helper(*args, **kwds): - return _GeneratorContextManager(func, args, kwds) - return helper - - -def asynccontextmanager(func): - """@asynccontextmanager decorator. - - Typical usage: - - @asynccontextmanager - async def some_async_generator(): - - try: - yield - finally: - - - This makes this: - - async with some_async_generator() as : - - - equivalent to this: - - - try: - = - - finally: - - """ - @wraps(func) - def helper(*args, **kwds): - return _AsyncGeneratorContextManager(func, args, kwds) - return helper - - -class closing(AbstractContextManager): - """Context to automatically close something at the end of a block. - - Code like this: - - with closing(.open()) as f: - - - is equivalent to this: - - f = .open() - try: - - finally: - f.close() - - """ - def __init__(self, thing): - self.thing = thing - def __enter__(self): - return self.thing - def __exit__(self, *exc_info): - self.thing.close() - - -class aclosing(AbstractAsyncContextManager): - """Async context manager for safely finalizing an asynchronously cleaned-up - resource such as an async generator, calling its ``aclose()`` method. - - Code like this: - - async with aclosing(.fetch()) as agen: - - - is equivalent to this: - - agen = .fetch() - try: - - finally: - await agen.aclose() - - """ - def __init__(self, thing): - self.thing = thing - async def __aenter__(self): - return self.thing - async def __aexit__(self, *exc_info): - await self.thing.aclose() - - -class _RedirectStream(AbstractContextManager): - - _stream = None - - def __init__(self, new_target): - self._new_target = new_target - # We use a list of old targets to make this CM re-entrant - self._old_targets = [] - - def __enter__(self): - self._old_targets.append(getattr(sys, self._stream)) - setattr(sys, self._stream, self._new_target) - return self._new_target - - def __exit__(self, exctype, excinst, exctb): - setattr(sys, self._stream, self._old_targets.pop()) - - -class redirect_stdout(_RedirectStream): - """Context manager for temporarily redirecting stdout to another file. - - # How to send help() to stderr - with redirect_stdout(sys.stderr): - help(dir) - - # How to write help() to a file - with open('help.txt', 'w') as f: - with redirect_stdout(f): - help(pow) - """ - - _stream = "stdout" - - -class redirect_stderr(_RedirectStream): - """Context manager for temporarily redirecting stderr to another file.""" - - _stream = "stderr" - - -class suppress(AbstractContextManager): - """Context manager to suppress specified exceptions - - After the exception is suppressed, execution proceeds with the next - statement following the with statement. - - with suppress(FileNotFoundError): - os.remove(somefile) - # Execution still resumes here if the file was already removed - """ - - def __init__(self, *exceptions): - self._exceptions = exceptions - - def __enter__(self): - pass - - def __exit__(self, exctype, excinst, exctb): - # 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 - return exctype is not None and issubclass(exctype, self._exceptions) - - -class _BaseExitStack: - """A base class for ExitStack and AsyncExitStack.""" - - @staticmethod - def _create_exit_wrapper(cm, cm_exit): - return MethodType(cm_exit, cm) - - @staticmethod - def _create_cb_wrapper(*args, **kwds): - # Python 3.6/3.7 compatibility: no native positional-only args syntax - callback, *args = args - def _exit_wrapper(exc_type, exc, tb): - callback(*args, **kwds) - return _exit_wrapper - - def __init__(self): - self._exit_callbacks = deque() - - def pop_all(self): - """Preserve the context stack by transferring it to a new instance.""" - new_stack = type(self)() - new_stack._exit_callbacks = self._exit_callbacks - self._exit_callbacks = deque() - return new_stack - - def push(self, exit): - """Registers a callback with the standard __exit__ method signature. - - Can suppress exceptions the same way __exit__ method can. - Also accepts any object with an __exit__ method (registering a call - to the method instead of the object itself). - """ - # We use an unbound method rather than a bound method to follow - # the standard lookup behaviour for special methods. - _cb_type = type(exit) - - try: - exit_method = _cb_type.__exit__ - except AttributeError: - # Not a context manager, so assume it's a callable. - self._push_exit_callback(exit) - else: - self._push_cm_exit(exit, exit_method) - return exit # Allow use as a decorator. - - def enter_context(self, cm): - """Enters the supplied context manager. - - If successful, also pushes its __exit__ method as a callback and - returns the result of the __enter__ method. - """ - # We look up the special methods on the type to match the with - # statement. - _cm_type = type(cm) - _exit = _cm_type.__exit__ - result = _cm_type.__enter__(cm) - self._push_cm_exit(cm, _exit) - return result - - def callback(*args, **kwds): - """Registers an arbitrary callback and arguments. - - Cannot suppress exceptions. - """ - # Python 3.6/3.7 compatibility: no native positional-only args syntax - try: - self, callback, *args = args - except ValueError as exc: - exc_details = str(exc).partition("(")[2] - msg = "Not enough positional arguments {}".format(exc_details) - raise TypeError(msg) from None - _exit_wrapper = self._create_cb_wrapper(callback, *args, **kwds) - - # We changed the signature, so using @wraps is not appropriate, but - # setting __wrapped__ may still help with introspection. - _exit_wrapper.__wrapped__ = callback - self._push_exit_callback(_exit_wrapper) - return callback # Allow use as a decorator - - def _push_cm_exit(self, cm, cm_exit): - """Helper to correctly register callbacks to __exit__ methods.""" - _exit_wrapper = self._create_exit_wrapper(cm, cm_exit) - self._push_exit_callback(_exit_wrapper, True) - - def _push_exit_callback(self, callback, is_sync=True): - self._exit_callbacks.append((is_sync, callback)) - - -# Inspired by discussions on http://bugs.python.org/issue13585 -class ExitStack(_BaseExitStack, AbstractContextManager): - """Context manager for dynamic management of a stack of exit callbacks. - - For example: - with ExitStack() as stack: - files = [stack.enter_context(open(fname)) for fname in filenames] - # All opened files will automatically be closed at the end of - # the with statement, even if attempts to open files later - # in the list raise an exception. - """ - - def __enter__(self): - return self - - def __exit__(self, *exc_details): - received_exc = exc_details[0] is not None - - # We manipulate the exception state so it behaves as though - # we were actually nesting multiple with statements - frame_exc = sys.exc_info()[1] - def _fix_exception_context(new_exc, old_exc): - # Context may not be correct, so find the end of the chain - while 1: - exc_context = new_exc.__context__ - if exc_context is old_exc: - # Context is already set correctly (see issue 20317) - return - if exc_context is None or exc_context is frame_exc: - break - new_exc = exc_context - # Change the end of the chain to point to the exception - # we expect it to reference - new_exc.__context__ = old_exc - - # Callbacks are invoked in LIFO order to match the behaviour of - # nested context managers - suppressed_exc = False - pending_raise = False - while self._exit_callbacks: - is_sync, cb = self._exit_callbacks.pop() - assert is_sync - try: - if cb(*exc_details): - suppressed_exc = True - pending_raise = False - exc_details = (None, None, None) - except: - new_exc_details = sys.exc_info() - # simulate the stack of exceptions by setting the context - _fix_exception_context(new_exc_details[1], exc_details[1]) - pending_raise = True - exc_details = new_exc_details - if pending_raise: - try: - # bare "raise exc_details[1]" replaces our carefully - # set-up context - fixed_ctx = exc_details[1].__context__ - raise exc_details[1] - except BaseException: - exc_details[1].__context__ = fixed_ctx - raise - return received_exc and suppressed_exc - - def close(self): - """Immediately unwind the context stack.""" - self.__exit__(None, None, None) - - -# Inspired by discussions on https://bugs.python.org/issue29302 -class AsyncExitStack(_BaseExitStack, AbstractAsyncContextManager): - """Async context manager for dynamic management of a stack of exit - callbacks. - - For example: - async with AsyncExitStack() as stack: - connections = [await stack.enter_async_context(get_connection()) - for i in range(5)] - # All opened connections will automatically be released at the - # end of the async with statement, even if attempts to open a - # connection later in the list raise an exception. - """ - - @staticmethod - def _create_async_exit_wrapper(cm, cm_exit): - return MethodType(cm_exit, cm) - - @staticmethod - def _create_async_cb_wrapper(*args, **kwds): - # Python 3.6/3.7 compatibility: no native positional-only args syntax - callback, *args = args - async def _exit_wrapper(exc_type, exc, tb): - await callback(*args, **kwds) - return _exit_wrapper - - async def enter_async_context(self, cm): - """Enters the supplied async context manager. - - If successful, also pushes its __aexit__ method as a callback and - returns the result of the __aenter__ method. - """ - _cm_type = type(cm) - _exit = _cm_type.__aexit__ - result = await _cm_type.__aenter__(cm) - self._push_async_cm_exit(cm, _exit) - return result - - def push_async_exit(self, exit): - """Registers a coroutine function with the standard __aexit__ method - signature. - - Can suppress exceptions the same way __aexit__ method can. - Also accepts any object with an __aexit__ method (registering a call - to the method instead of the object itself). - """ - _cb_type = type(exit) - try: - exit_method = _cb_type.__aexit__ - except AttributeError: - # Not an async context manager, so assume it's a coroutine function - self._push_exit_callback(exit, False) - else: - self._push_async_cm_exit(exit, exit_method) - return exit # Allow use as a decorator - - def push_async_callback(*args, **kwds): - """Registers an arbitrary coroutine function and arguments. - - Cannot suppress exceptions. - """ - # Python 3.6/3.7 compatibility: no native positional-only args syntax - try: - self, callback, *args = args - except ValueError as exc: - exc_details = str(exc).partition("(")[2] - msg = "Not enough positional arguments {}".format(exc_details) - raise TypeError(msg) from None - _exit_wrapper = self._create_async_cb_wrapper(callback, *args, **kwds) - - # We changed the signature, so using @wraps is not appropriate, but - # setting __wrapped__ may still help with introspection. - _exit_wrapper.__wrapped__ = callback - self._push_exit_callback(_exit_wrapper, False) - return callback # Allow use as a decorator - - async def aclose(self): - """Immediately unwind the context stack.""" - await self.__aexit__(None, None, None) - - def _push_async_cm_exit(self, cm, cm_exit): - """Helper to correctly register coroutine function to __aexit__ - method.""" - _exit_wrapper = self._create_async_exit_wrapper(cm, cm_exit) - self._push_exit_callback(_exit_wrapper, False) - - async def __aenter__(self): - return self - - async def __aexit__(self, *exc_details): - received_exc = exc_details[0] is not None - - # We manipulate the exception state so it behaves as though - # we were actually nesting multiple with statements - frame_exc = sys.exc_info()[1] - def _fix_exception_context(new_exc, old_exc): - # Context may not be correct, so find the end of the chain - while 1: - exc_context = new_exc.__context__ - if exc_context is old_exc: - # Context is already set correctly (see issue 20317) - return - if exc_context is None or exc_context is frame_exc: - break - new_exc = exc_context - # Change the end of the chain to point to the exception - # we expect it to reference - new_exc.__context__ = old_exc - - # Callbacks are invoked in LIFO order to match the behaviour of - # nested context managers - suppressed_exc = False - pending_raise = False - while self._exit_callbacks: - is_sync, cb = self._exit_callbacks.pop() - try: - if is_sync: - cb_suppress = cb(*exc_details) - else: - cb_suppress = await cb(*exc_details) - - if cb_suppress: - suppressed_exc = True - pending_raise = False - exc_details = (None, None, None) - except: - new_exc_details = sys.exc_info() - # simulate the stack of exceptions by setting the context - _fix_exception_context(new_exc_details[1], exc_details[1]) - pending_raise = True - exc_details = new_exc_details - if pending_raise: - try: - # bare "raise exc_details[1]" replaces our carefully - # set-up context - fixed_ctx = exc_details[1].__context__ - raise exc_details[1] - except BaseException: - exc_details[1].__context__ = fixed_ctx - raise - return received_exc and suppressed_exc - - -class nullcontext(AbstractContextManager, AbstractAsyncContextManager): - """Context manager that does no additional processing. - - Used as a stand-in for a normal context manager, when a particular - block of code is only sometimes used with a normal context manager: - - cm = optional_cm if condition else nullcontext() - with cm: - # Perform operation, using optional_cm if condition is True - """ - - def __init__(self, enter_result=None): - self.enter_result = enter_result - - def __enter__(self): - return self.enter_result - - def __exit__(self, *excinfo): - pass - - async def __aenter__(self): - return self.enter_result - - async def __aexit__(self, *excinfo): - pass - - -# Preserve backwards compatibility -class ContextStack(ExitStack): - """Backwards compatibility alias for ExitStack""" - - def __init__(self): - warnings.warn("ContextStack has been renamed to ExitStack", - DeprecationWarning) - super(ContextStack, self).__init__() - - def register_exit(self, callback): - return self.push(callback) - - def register(self, callback, *args, **kwds): - return self.callback(callback, *args, **kwds) - - def preserve(self): - return self.pop_all() diff --git a/lib/contextlib2/__init__.pyi b/lib/contextlib2/__init__.pyi deleted file mode 100644 index d42c6b05..00000000 --- a/lib/contextlib2/__init__.pyi +++ /dev/null @@ -1,132 +0,0 @@ -# Type hints copied from the typeshed project under the Apache License 2.0 -# https://github.com/python/typeshed/blob/64c85cdd449ccaff90b546676220c9ecfa6e697f/LICENSE - -import sys -from types import TracebackType -from typing import ( - IO, - Any, - AsyncContextManager, - AsyncIterator, - Awaitable, - Callable, - ContextManager, - Iterator, - Optional, - Type, - TypeVar, - overload, -) -from typing_extensions import ParamSpec, Protocol - -# contextlib2 API adaptation notes: -# * the various 'if True:' guards replace sys.version checks in the original -# typeshed file (those APIs are available on all supported versions) -# * deliberately omitted APIs are listed in `dev/mypy.allowlist` -# (e.g. deprecated experimental APIs that never graduated to the stdlib) - -AbstractContextManager = ContextManager -if True: - AbstractAsyncContextManager = AsyncContextManager - -_T = TypeVar("_T") -_T_co = TypeVar("_T_co", covariant=True) -_T_io = TypeVar("_T_io", bound=Optional[IO[str]]) -_F = TypeVar("_F", bound=Callable[..., Any]) -_P = ParamSpec("_P") - -_ExitFunc = Callable[[Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]], bool] -_CM_EF = TypeVar("_CM_EF", ContextManager[Any], _ExitFunc) - -class _GeneratorContextManager(ContextManager[_T_co]): - def __call__(self, func: _F) -> _F: ... - -# type ignore to deal with incomplete ParamSpec support in mypy -def contextmanager(func: Callable[_P, Iterator[_T]]) -> Callable[_P, _GeneratorContextManager[_T]]: ... # type: ignore - -if True: - def asynccontextmanager(func: Callable[_P, AsyncIterator[_T]]) -> Callable[_P, AsyncContextManager[_T]]: ... # type: ignore - -class _SupportsClose(Protocol): - def close(self) -> object: ... - -_SupportsCloseT = TypeVar("_SupportsCloseT", bound=_SupportsClose) - -class closing(ContextManager[_SupportsCloseT]): - def __init__(self, thing: _SupportsCloseT) -> None: ... - -if True: - class _SupportsAclose(Protocol): - async def aclose(self) -> object: ... - _SupportsAcloseT = TypeVar("_SupportsAcloseT", bound=_SupportsAclose) - class aclosing(AsyncContextManager[_SupportsAcloseT]): - def __init__(self, thing: _SupportsAcloseT) -> None: ... - _AF = TypeVar("_AF", bound=Callable[..., Awaitable[Any]]) - class AsyncContextDecorator: - def __call__(self, func: _AF) -> _AF: ... - -class suppress(ContextManager[None]): - def __init__(self, *exceptions: Type[BaseException]) -> None: ... - def __exit__( - self, exctype: Optional[Type[BaseException]], excinst: Optional[BaseException], exctb: Optional[TracebackType] - ) -> bool: ... - -class redirect_stdout(ContextManager[_T_io]): - def __init__(self, new_target: _T_io) -> None: ... - -class redirect_stderr(ContextManager[_T_io]): - def __init__(self, new_target: _T_io) -> None: ... - -class ContextDecorator: - def __call__(self, func: _F) -> _F: ... - -_U = TypeVar("_U", bound=ExitStack) - -class ExitStack(ContextManager[ExitStack]): - def __init__(self) -> None: ... - def enter_context(self, cm: ContextManager[_T]) -> _T: ... - def push(self, exit: _CM_EF) -> _CM_EF: ... - def callback(self, callback: Callable[..., Any], *args: Any, **kwds: Any) -> Callable[..., Any]: ... - def pop_all(self: _U) -> _U: ... - def close(self) -> None: ... - def __enter__(self: _U) -> _U: ... - def __exit__( - self, - __exc_type: Optional[Type[BaseException]], - __exc_value: Optional[BaseException], - __traceback: Optional[TracebackType], - ) -> bool: ... - -if True: - _S = TypeVar("_S", bound=AsyncExitStack) - - _ExitCoroFunc = Callable[[Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]], Awaitable[bool]] - _CallbackCoroFunc = Callable[..., Awaitable[Any]] - _ACM_EF = TypeVar("_ACM_EF", AsyncContextManager[Any], _ExitCoroFunc) - class AsyncExitStack(AsyncContextManager[AsyncExitStack]): - def __init__(self) -> None: ... - def enter_context(self, cm: ContextManager[_T]) -> _T: ... - def enter_async_context(self, cm: AsyncContextManager[_T]) -> Awaitable[_T]: ... - def push(self, exit: _CM_EF) -> _CM_EF: ... - def push_async_exit(self, exit: _ACM_EF) -> _ACM_EF: ... - def callback(self, callback: Callable[..., Any], *args: Any, **kwds: Any) -> Callable[..., Any]: ... - def push_async_callback(self, callback: _CallbackCoroFunc, *args: Any, **kwds: Any) -> _CallbackCoroFunc: ... - def pop_all(self: _S) -> _S: ... - def aclose(self) -> Awaitable[None]: ... - def __aenter__(self: _S) -> Awaitable[_S]: ... - def __aexit__( - self, - __exc_type: Optional[Type[BaseException]], - __exc_value: Optional[BaseException], - __traceback: Optional[TracebackType], - ) -> Awaitable[bool]: ... - -if True: - class nullcontext(AbstractContextManager[_T]): - enter_result: _T - @overload - def __init__(self: nullcontext[None], enter_result: None = ...) -> None: ... - @overload - def __init__(self: nullcontext[_T], enter_result: _T) -> None: ... - def __enter__(self) -> _T: ... - def __exit__(self, *exctype: Any) -> bool: ...