Questionインスタンスがimportされない

Question

前提・実現したいこと

初めてのDjango アプリ作成4を進めている最中です
https://docs.djangoproject.com/ja/2.2/intro/tutorial04/

発生している問題・エラーメッセージ

Class 'Question' has no 'objects' member
Class 'Choice' has no 'DoesNotExist' member

該当のソースコード

の様にディレクトリが構成されています。

#polls/views.pyのコードの中身
from django.http import HttpResponse, HttpResponseRedirect
from django.template import loader
from django.http import Http404
from django.urls import reverse
from django.shortcuts import get_object_or_404, render
from .models import Choice, Question
def index(request):
latest_question_list = Question.objects.order_by('-pub_date')[:5]
context = {'latest_question_list': latest_question_list}
return render(request, 'polls/index.html', context)

def detail(request, question_id):
question = get_object_or_404(Question, pk=question_id)
return render(request, 'polls/detail.html', {'question': question})

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):

    return render(request, 'polls/detail.html', {
        'question': question,
        'error_message': "You didn't select a choice.",
    })
else:
    selected_choice.votes += 1
    selected_choice.save()
    return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

def results(request, question_id):
question = get_object_or_404(Question, pk=question_id)
return render(request, 'polls/results.html', {'question': question})

#polls/models.pyのソースコードの中身

import datetime
from django.db import models
from django.utils import timezone

class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

def __str__(self):
    return self.question_text

def was_published_recently(self):
    return self.pub_date >= timezone.now()

datetime.timedelta(days=1)

class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)

def __str__(self):
    return self.choice_text

試したこと

https://stackoverflow.com/questions/45135263/class-has-no-objects-member
このサイトを参考に、pylint-djangoをインストールし、VS codeのPythonのsettings.jsonで

{"python.linting.pylintArgs": [
"--load-plugins=pylint_django"
],}

を記述したのですが、どこに書いても

このように、エラーが出てしまいます。

補足情報（FW/ツールのバージョンなど）

Surface Laptop2
Windows 1809
Python 3.7.4
Django 2.2.6
VS codeは最新バージョン

よろしくお願いします