diy1.py

username = "python"
i=3
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
        if name != username:
            print("用户名错误，请重新输入！")
            print("温馨提示：你还有"+str(i)+"次登陆机会")
            continue
        if password != userpassword:
            print("密码输入有误，请重新输入")
            print("温馨提示：你还有"+str(i)+"次登陆机会")
    else:
        print("三次机会已用完，账户已锁定")  
        exit()
print("欢迎来到贝尔编程!")