Testing function for Flex Regular Expressions to FST DFA

def main():
    """
    Testing function for Flex Regular Expressions to FST DFA
    """
    if len(argv) < 2:
        print 'Usage: %s fst_file [optional: save_file]' % argv[0]
        return
    flex_a = Flexparser()
    mma = flex_a.yyparse(argv[1])
    mma.minimize()
    print mma
    if len(argv) == 3:
        mma.save(argv[2])