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from contextlib import contextmanager from pip._vendor.contextlib2 import ExitStack from pip._internal.utils.typing import MYPY_CHECK_RUNNING if MYPY_CHECK_RUNNING: from typing import Iterator, ContextManager, TypeVar _T = TypeVar('_T', covariant=True) class CommandContextMixIn(object): def __init__(self): # type: () -> None super(CommandContextMixIn, self).__init__() self._in_main_context = False self._main_context = ExitStack() @contextmanager def main_context(self): # type: () -> Iterator[None] assert not self._in_main_context self._in_main_context = True try: with self._main_context: yield finally: self._in_main_context = False def enter_context(self, context_provider): # type: (ContextManager[_T]) -> _T assert self._in_main_context return self._main_context.enter_context(context_provider)