python的argparse的使用

import argparse

parse = argparse.ArgumentParser("compute the sum of a and b")
parse.add_argument('-a', '--a_num', type=int, default=4)
parse.add_argument('-b', '--b_num', type=int, default=5)
FLAGS = parse.parse_args()

answer = FLAGS.a_num + FLAGS.b_num

print("the answer is {}".format(answer))

# D:\PycharmProjects\GAN>python test.py -a 1 -b 2
# the answer is 3
# 
# D:\PycharmProjects\GAN>python test.py
# the answer is 9