PyTest compare numbers relatively

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examples/pytest/test_number_less_than.py

def get_number():
    return 23

def test_string_equal():
    assert get_number() < 0 

$ pytest test_number_less_than.py

    def test_string_equal():
>       assert get_number() < 0
E       assert 23 < 0
E        +  where 23 = get_number()