def vote(request):
 if request.user.is_authenticated() and request.user.has_perm('polls.can_vote')):
  # vote here
 else:
  return HttpResponse("You can't vote in this poll.")

def user_can_vote(user):
 return user.is_authenticated() and user.has_perm("polls.can_vote")

@user_passes_test(user_can_vote, login_url="/login/")
def vote(request):
 # Code here can assume a logged-in user with the correct permission.
 ...

from django.contrib.auth.decorators import permission_required

@permission_required('polls.can_vote', login_url="/login/")
def vote(request):
 # ...

from django.contrib.auth.decorators import login_required
from django.views.generic.date_based import object_detail

@login_required
def limited_object_detail(*args, **kwargs):
 return object_detail(*args, **kwargs)