auto save

diy2.py

+i = 3
 username = "python"
 userpassword = "123456"
-while True:
+        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