用python写随机验证码(python随机生成4位验证码)

1.用户输入的验证码不区分大小写

2.如需验证大小写，则去掉if判断语句里面的lower（）即可

# 四个随机数验证码
code = ''
s = 'QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm0123456789'
for i in range(4):
    ran = random.randint(0, len(s)-1)
    code += s[ran]
print(code)
user_name = input('请输入验证码:')
if user_name.lower() == code.lower():
    print('验证码正确！！！！')
else:
    print('验证码错误！！！')