def __exit__()

in later/unittest/backport/mock.py [0:0]


    def __exit__(self, *exc_info):
        """Undo the patch."""
        if not _is_started(self):
            return

        if self.is_local and self.temp_original is not DEFAULT:
            setattr(self.target, self.attribute, self.temp_original)
        else:
            delattr(self.target, self.attribute)
            if not self.create and (not hasattr(self.target, self.attribute) or
                        self.attribute in ('__doc__', '__module__',
                                           '__defaults__', '__annotations__',
                                           '__kwdefaults__')):
                # needed for proxy objects like django settings
                setattr(self.target, self.attribute, self.temp_original)

        del self.temp_original
        del self.is_local
        del self.target
        for patcher in reversed(self.additional_patchers):
            if _is_started(patcher):
                patcher.__exit__(*exc_info)