1.py

username = "python"
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("用户名不存在,请重新输入!")
    if password != userpassword:
        print("密码输入有误,请重新输入!")
else:
print("你的账户已被锁定，请重新输入！")
exit()