#登录接口

print("请输入用户名密码")

_username = "sun"

_password = ""

count = 0

while count < 3:

    username = input("用户名:")

    password = input("密码:")

    if _username == username and _password == password:

        print("恭喜{name}登录成功！".format(name=username))

        break

    elif _username != username:

        print("用户名错误!")

    else:

        print("密码错误！")

    count += 1

    if count == 3:

        print("登陆失败次数过多！")