Example driven function finder

def test_df_shape():
    df = pd.DataFrame({"a": [1, 2, 3]})
    df2 = pd.DataFrame({"a": [4, 5, 6]})

    def object_generator():
        return deepcopy([df, df2])

    def criteria(output):
        return len(output) == 6

    functions = [
        getattr(pd, attr) for attr in dir(pd) if isinstance(getattr(pd, attr), Callable)
    ]
    path = find_function_match(object_generator, criteria, functions)
    assert path.__name__ == "concat"