[Python] Mocking a class method attribute returns AttributeError

How can I mock the value of x to "bar" instead of "foo"?

import pytest


class Command():

def run(self):
x = "foo"
return x


def test(mocker):
mocker.patch("myapp.tests.test_mocker.Command.run.x", "bar")
c = Command()
print(c.run())


pytest returns AttributeError: <function Command.run at 0x7f4910e23f70> does not have the attribute 'x'

https://pypi.org/project/pytest-mock/

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