[Django]name 'HttpResponse' is not defined

在跟着蟲師的書一步一步的做的時候，出現了以下的問題：

 

 “HttpResponse” is not defined , so i need to modify the views.py in sign folder as bellow:

from django.shortcuts import render
from django.http import HttpResponse # Create your views here.

def index(request):
        return HttpResponse("hello Djando!")

then execute again ,python3 manage.py runserver