"Die Ansicht" polls.views.index "hat kein HttpResponse-Objekt zurückgegeben. Stattdessen wurde" None "zurückgegeben." Fehler in Django

Question

Ich befolge das Tutorial in Django Dokumentation. Ich habe genau wie gesagt in der tutorial getan.

Valueerror auf/Umfragen/

Wenn ich auf Browser laden "http://localhost:8000/polls/" Ich bekomme diese Fehlermeldung:

The view polls.views.index didn't return an HttpResponse object. It returned None instead. 

Request Method:  GET 
Request URL: http://localhost:8000/polls/ 
Django Version:  1.10.1 
Exception Type:  ValueError 
Exception Value:  

The view polls.views.index didn't return an HttpResponse object. It returned None instead. 

Exception Location:  /home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/django/core/handlers/base.py in _get_response, line 198 
Python Executable: /home/jack/anaconda2/envs/py3k/bin/python 
Python Version:  3.4.5 
Python Path:  

['/home/jack/Documents/Django Learning/mysite', 
'/home/jack/anaconda2/envs/py3k/lib/python34.zip', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4/plat-linux', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4/lib-dynload', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/Sphinx-1.4.1-py3.4.egg', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/setuptools-23.0.0-py3.4.egg', 
'/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages'] 

Server time: Thu, 6 Oct 2016 10:32:20 +0000 

Code Of mysite/polls/views.py

from django.shortcuts import render 
from django.http import HttpResponse 

def index(request): 
    HttpResponse("Welcome to poll's index!") 
# Create your views here. 

Answer 1

HttpResponse("Welcome to poll's index!") .sollte

sein

return HttpResponse("Welcome to poll's index!") 

Sie geben nichts aus Ihrer Sicht zurück.