auto save

1.py

@@ -13,6 +13,9 @@ while True:
     if a==username and b==userpassword:
         print("登录成功")
         break
+    if name !=username:
+        print("用户名不存在")
+    elif password != userpassword 
     print("用户名和密码错误，请重新输入")
 
 print("欢迎来到贝尔编程")
\ No newline at end of file