[Python] how to mock a function in pytest monkeypatch?

I am trying to mock a simple function but I get an AttributeError and have no clue on how to fix it.

def my_function():
return "original"

def mock_my_function():
return "mocked"

def test_my_function(monkeypatch):
monkeypatch.setattr(__name__, 'my_function', mock_my_function)
assert my_function() == "mocked"


What should I put in __name__'s place to make it work?

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