random 模块，随机生成验证码

随机生成验证码：

此功能利用了chr 和random功能

1 res =''
2 for i in range(6):
3     num = str(random.randint(0,9))
4     al_num = random.randint(97,122)
5     al_num2 = random.randint(65,90)
6     alpha = chr(al_num)
7     alpha2 = chr(al_num2)
8     res += random.choice([num,alpha,alpha2])
9 print(res)