auto save

diy1.py

@@ -6,6 +6,8 @@ while True:
     if name==username and password==userpassword:
     if name==username and password==userpassword:
         print("登录成功")
         print("登录成功")
         break
         break
+    if expression:
+        pass
     print("用户名和密码错误！请重新输入")
     print("用户名和密码错误！请重新输入")
 print("欢迎来到贝尔编程")
 print("欢迎来到贝尔编程")