>>> from unittest import mock
... class Foo:
...     bar = None
... patch = mock.patch.object(Foo, 'bar', 'x')
>>> patch.start()
'x'
>>> patch.start()
'x'
>>> patch.stop()
False
>>> patch.stop()
Traceback (most recent call last):
  File "...", line ..., in runcode
    coro = func()
  File "<input>", line 1, in <module>
  File "/usr/lib/python3.8/unittest/mock.py", line 1542, in stop
    return self.__exit__(None, None, None)
  File "/usr/lib/python3.8/unittest/mock.py", line 1508, in __exit__
    if self.is_local and self.temp_original is not DEFAULT:
AttributeError: '_patch' object has no attribute 'is_local'