def _same_file(filen1, filen2):
    """_same_file
    Return True if filen1 and filen2 contains the same data

    Args:
        filen1 (str): The path and name of the first filename
        filen2 (str): The path and name of the second filename

    Returns:
        A bool indicating if the two files contains the same data 
    """
    assert filen1 != filen2, "File names must be different."
    with open(filen1, "r") as filep_ref:
        with open(filen2, "r") as filep_test:
            for line_ref, line_test in zip(filep_ref, filep_test):
                assert line_ref == line_test, "Invalid line generated:\n" + line_test + "\nthat is different from the reference file:\n" + line_ref
    return True