save project

diy1.py

@@ -8,7 +8,10 @@ while True:
     if user_name==username and user_password==userpassword:
     if user_name==username and user_password==userpassword:
         print("登陆成功")
         print("登陆成功")
         break
         break
-    print("密码或账号错误，请重新输入")
+    if username!=user_name:
+        print("用户名不存在")
+    if userpassword!=user_password:
+        print("密码错误！")
 print("欢迎来到贝尔编程")
 print("欢迎来到贝尔编程")