def csv_commented_header(input_file: str) -> list:
    """
    Read in the comment header in CSV file to re-populate later

    :param input_file: Full path to CSV file

    :return: CSV header
    """

    f = open(input_file, 'r')
    f_all = f.readlines()
    header = [line for line in f_all if line.startswith('#')]

    f.close()
    return header