第 0001 题： 做为 Apple Store App 独立开发者，你要搞限时促销，为你的应用生成激活码（或者优惠券），使用 Python 如何生成 200 个激活码（或者优惠券）？
Python练习册,每天一个小程序:https://github.com/Yixiaohan/show-me-the-code
#!/usr/bin/env python3
#coding = utf-8
import random
import string
def create_key(num, group = 4):
"""return a file with secret key
group -- the number of consisting parts. 'XaD1-SDA1-3S4S', group = 3.
num -- the number of keys.
"""
field = string.ascii_letters + string.digits #[A-Za-z0-9]
with open("secret_key.txt", "w") as f:
for i in range(num):
key ='-'.join(
[''.join(random.sample(field, 4)) #a string, like 'XaD1'
#>>>random.sample('abcdefghij', 3)
# ['a', 'd', 'b']
for _ in range(group)] #creat string groupth.
) #a string for secret_key
f.write(key+'\n')
if __name__ == "__main__":
create_key(200)
#使用命令执行python文件
#https://www.cnblogs.com/HeDaoYiWenZi/articles/2855965.html
#
#linux 命令执行
#$chmod u+x create_key.py
