save project

diy1.py

@@ -6,6 +6,8 @@ while True:
     if username == name and userpassword == password:
         print("登陆成功!")
         break 
-    
-    print("密码或用户名错误！")
+    if username != name:
+        print("用户名不存在，请重新输入。")
+    if userpassword != password:
+        print("密码错误，请重新输入。")
 print("欢迎来到贝尔世界！")
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