问“‘method”对象不能订阅，尝试使用google api图书

EN

def books(request):
    if request.method == "POST":
        form = DashboardForm(request.POST)
        text = request.POST['text']
        url = 'https://www.googleapis.com/books/v1/volumes?q='+text
        r = requests.get(url)
        answer = r.json
        result = []
        for i in range(10):
            result_dict= {
                'title':answer['items'][i]['volumeInfo']['title'], # This line is showing error. 
                'subtitle': answer['items'][i]['volumeInfo']['title'].get('subtitle'),
                'description': answer['items'][i]['volumeInfo']['title'].get('description'),
                'count': answer['items'][i]['volumeInfo']['title'].get('pageCount'),
                'categories': answer['items'][i]['volumeInfo']['title'].get('categories'),
                'rating': answer['items'][i]['volumeInfo']['title'].get('pageRating'),
                'thumbnail': answer['items'][i]['volumeInfo']['title'].get('imageLinks'),
                'preview': answer['items'][i]['volumeInfo']['title'].get('previewLink')
            }
            result.append(result_dict)
            context={
                'form':form,
                'results':result,
            }
        return render(request,'dashboard/books.html',context)
    else:
        form = DashboardForm()
    context = {'form':form}
    return render(request,'dashboard/books.html',context)