diy2.py

username = "python"
userpassword = "123456"
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("用户名错误!请重新输入")
            print("温馨提示：您还有"+str(i)+"次登录机会")
            continue
        if password!=userpassword:
            print("用密码错误!请重新输入")
            print("温馨提示：您还有"+str(i)+"次登录机会")
    else:
        print("你的账户已锁定，请一个小时后再来输入")
        exit()
print("欢迎来到贝尔编程!")