save project

diy.py

@@ -6,5 +6,8 @@ while True:
     if name == username and userpassward == passward:
         print("登陆成功")
         break
-    print("密码或用户名错误！请重新输入密码或用户名！")
+    if name != username:
+        print("用户名不存在，请重新输入！")
+    if passward != userpassward:
+        print("密码输入有误，请重新输入！")
 print("欢迎来到贝尔编程！")
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