diy2.py

i=3
name = "python"
userpassword = "123456"
while True:
    if i>0:
        name = input("请输入用户名:")
        
        password = input("请输入密码:")
        i-=i
        if name == username and password == userpassword:
            print("登录成功!")
            break
        if name!=username:
            print("账号不存在，请重新输入")
            continue
        if password!=userpassword:  
            print("密码错误!请重新输入")
    else:
        print("你的账户已被锁定，请带上身份证来太阳系地球中国浙江省温州市瑞安市解锁")
        exit()
print("欢迎来到贝尔编程!")