_multierror.py 文件源码

def __exit__(self, etype, exc, tb):
        if exc is not None:
            filtered_exc = MultiError.filter(self._handler, exc)
            if filtered_exc is exc:
                # Let the interpreter re-raise it
                return False
            if filtered_exc is None:
                # Swallow the exception
                return True
            # When we raise filtered_exc, Python will unconditionally blow
            # away its __context__ attribute and replace it with the original
            # exc we caught. So after we raise it, we have to pause it while
            # it's in flight to put the correct __context__ back.
            old_context = filtered_exc.__context__
            try:
                raise filtered_exc
            finally:
                _, value, _ = sys.exc_info()
                assert value is filtered_exc
                value.__context__ = old_context