save project

diy1.py

@@ -6,5 +6,11 @@ while True:
     if username == name and userpassword == password:
         print("登录成功")
         break
+    elif username != name and userpassword != password:
+        print ("密码与账号错误，请重新输入")
+    elif username != name:
+        print("用户名不存在，请重新输入")
+    elif userpassword != password:
+        print("密码错误，请重新输入")
     else:
         print("请重新填写")