Why is error when using mock? OSError: reading from stdin while output is captured

I have a main function. In itself, it takes 3 arguments - age, gender, source_of_income.

These arguments are passed via input() to the function.

I want to create a test for it via py test and replace the incoming data:

from unittest.mock import patch


def expected_values():
    for item in [2,"F","собственный бизнес"]:
        yield item

exp_gen = expected_values()

@patch('builtins.input', lambda *args: next(exp_gen))
def test_main():
    assert main.main(age=-2,gender="F",source_of_income="собственный бизнес") 

but still the test - does not work

raise IOError("reading from stdin while output is captured")
   OSError: reading from stdin while output is captured 

What am I doing wrong?