Question

我想使用numpy数组，如下所示：

from django.shortcuts import get_object_or_404, render
from django.http import HttpResponseRedirect, HttpResponse
from django.core.urlresolvers import reverse
from django.views import generic
from django.utils import timezone 

from .models import Choice, Question


class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'

    def get_queryset(self):
        """Return the last five published questions (not including those published in the future)."""
        return Question.objects.filter(pub_date__lte=timezone.now()).order_by('-pub_date')[:5]

class DetailView(generic.DetailView):
    model = Question 
    template_name = 'polls/detail.html'

    def get_queryset(self):
        """
        Excludes any questions that aren't published yet.
        """
        return Question.objects.filter(pub_date__lte=timezone.now())

class ResultsView(generic.DetailView):
    model = Question 
    template_name = 'polls/results.html'

def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

room_1_class_value = numpy.empty(len(room_1_indices[0])).fill(1)是一个数组，我可以看到该数组的输出。但为什么我为“room_1_class_value”获得“无”？

谢谢，

Answer 1

因为您没有将numpy数组分配给room_1_class_value。您正在为其分配fill(1)函数调用的值。此功能不会返回任何内容。

尝试：

room_1_class_value = numpy.empty(len(room_1_indices[0]))
room_1_class_value.fill(1)

使用numpy.fill后得到非类型

1 个答案: