diy2.py

username = "python"
userpassword = "VIP大傻逼"
i=3
while True:
    if i>0:
        name = input("请输入用户名:")
        password = input("请输入密码:") 
        i-=1
        if name == username and password == userpassword:
            print("登录成功!")
            break
        if name != username:
            print("大傻逼,用户名不存在!请重新输入!") 
            continue
    else:
        print("已冻结账号，预计9999999年后解封")
        exit()
print("欢迎来到贝尔编程!")