def comments(request, article_id):

    if request.method == 'POST':

        form = (request.POST)
        Articles.objects.get(id=article_id)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(request.path_info)

    else:
    # метод GET

        form = CommentForm()
        comments = CommentForm.objects.all()

    return HttpResponseRedirect(article_id)

urlpatterns=[
    path('comments', views.comments, name='comments'),
    path('news/', ListView.as_view(queryset=Articles.objects.all().order_by("-date")[:20],template_name="news/posts.html")),
    path('<int:pk>/', DetailView.as_view(model=Articles, template_name="news/post.html")),
    path('aboutUs', views.aboutUs, name='aboutUs'),
]+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

class CommentForm(ModelForm):
        class Meta:
            model = Articles
            fields = ('whoAreYou','textComment')

class Articles(models.Model):
    title = models.CharField(max_length= 200)
    post = models.TextField()
    date = models.DateTimeField()
    img = models.ImageField(upload_to='', default="default_value")
    whoAreYou = models.CharField(max_length=100, default='Четко!')
    textComment = models.TextField(blank=False, default='Четко!')

    def __str__(self):
        return self.title

<div class="panel panel-default">
      <div class="panel-heading">
            <h1 class=" text-info">{{articles.title}}</h1>
      </div>
      <div class="panel-body">
          <p> {{articles.post|safe|linebreaks}}  </p>
            <h3 align="right" class=" text-info"> Опубликованно: {{articles.date|date:"d-m-Y в H:i"}}</h3>
      </div>

        <h4>Comments</h4>


    <form action="{% url 'comments' %}" method="post">
      {% csrf_token %}

      {% if comments %}
        {% for articles in comments %}
            {{ articles.whoAreYou }}<br>
          {{ articles.textComment }}<br>
        {% endfor %}
      {% endif %}
    <h3>Кто вы?</h3><input type="text" name="whoAreYou"> <br>
    <h3>Коммент</h3><input type="text" name="textComment"> <br>
      <input type="submit" value="Submit">
    </form>

{% endblock %}