How to perform assert_has_calls for a __getitem__() call?

Code:

from unittest.mock import MagicMock, call

mm = MagicMock()
mm().foo()['bar']

print(mm.mock_calls)
print()

mm.assert_has_calls([call(), call().foo(), call().foo().__getitem__('bar')])

Output:

[call(), call().foo(), call().foo().__getitem__('bar')]

Traceback (most recent call last):
  File "foo.py", line 9, in <module>
    mm.assert_has_calls([call(), call().foo(), call().foo().__getitem__('bar')])
TypeError: tuple indices must be integers or slices, not str

How to fix this assert?

from How to perform assert_has_calls for a __getitem__() call?