diy2.py

username = "python"
userpassword = "123456"
while True:
    if i>0
        name = input("请输入用户名:")
        password = input("请输入密码:")
        if name == username and password == userpassword:
            print("登录成功!")
            break
        elif name!=username and password !=userpassword:
            print("用户名不存在，请重新输入")
            continue
        else:
            print("密码错误，请重新输入")
    else:
        print("你的账户已被锁定,请五分钟后再试！")
        exit()
    
print("欢迎来到贝尔编程!")