diy2.py

i=3
username = "python"
userpassword = "123456"
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
        elif name != username:
            print("用户名错误，请重新输入")
        else:
            if password !=userpassword:
                print("密码错误，请重新输入")
    else:
        print("账户已被锁定")
print("欢迎来到贝尔编程!")