auto save

diy1.py

@@ -9,6 +9,10 @@ while True:
     if id==username and pw==userpassword:
     if id==username and pw==userpassword:
         print("登录成功！")
         print("登录成功！")
         break
         break
-    print("登录失败，请重新输入")
+    if id != username:
+        print("用户名不存在，请重新输入")
+        continue
+    if pw!= userpassword:
+        print("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")
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