auto save

diy2.py

@@ -6,8 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name != username and password == userpassword:
-        print("账号错误")
-    if name != userpassword and name == username:
+    if name != username:
+        print("此用户不存在")
+    if password != userpassword and name == username:
         print("密码错误")
+    
 print("欢迎来到贝尔编程!")
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