我有以下简单的看法。为什么会导致这个错误呢？
The view auth_lifecycle.views.user_profile didn't return an HttpResponse object. It returned None instead.
"""Renders web pages for the user-authentication-lifecycle project."""
from django.shortcuts import render
from django.template import RequestContext
from django.contrib.auth import authenticate, login
def user_profile(request):
"""Displays information unique to the logged-in user."""
user = authenticate(username='superuserusername', password='sueruserpassword')
login(request, user)
render(request, 'auth_lifecycle/user_profile.html',
context_instance=RequestContext(request))
因为视图必须return render，而不仅仅是调用它。 （注意render是一个简单的包装HttpResponse https://docs.djangoproject.com/en/dev/ref/request-response/#django.http.HttpResponse）。将最后一行更改为
return render(request, 'auth_lifecycle/user_profile.html',
context_instance=RequestContext(request))
（另请注意render(...) https://docs.djangoproject.com/en/dev/topics/http/shortcuts/#django.shortcuts.render函数返回a HttpResponse幕后对象 https://github.com/django/django/blob/f30c7e381c94f41d361877d8a3e90f8cfb391709/django/shortcuts.py#L17-L25.)
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