argparse

import argparse

def main():
    parser = argparse.ArgumentParser()

    parser.add_argument("-n", "--name", default="He")

    parser.add_argument("-g", "--gender", default="man")

    parser.add_argument("-a", "--age", default="20")

    print(parser)

    args = parser.parse_args()

    name = args.name
    gender = args.gender
    age = args.age

    print('I am {}, my gender is {},  I am {} years old'.format(name, gender, age))


if __name__ == "__main__":
    main()