12.3.py

username='aaaaaaaaa'
userpassword="1223456"
while True:
    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
    if name != username:
        print("用户名错误，请重新输入!")  
        continue
    if