How to solve "'NoneType' object has no attribute 'group'" and "Article matching query does not exist" error?

Question

Django

Added the ability to delete objects, which led to errors
1) Now, when I just edit the article or add a new one, the error
'NoneType' object has no attribute 'group'
takes off 2) Up to a certain point, deletion worked fine, specifically until go ahead 9 (10, 11, etc.)
Now, when I delete the object, the error
Article matching query does not exist
view.py takes off

def manage_articles(request):
    if not request.user.is_staff:
            return redirect('/')
    ArticleFormSet = modelformset_factory(Article, fields=('title', 'priceMazut', 'priceSPBT',
                                                           'priceDTl', 'priceDTm', 'priceDTz'))
    if request.method == 'POST':
        enurl = urllib.parse.urlencode(request.POST) 
        matchobj = re.search(r'del_btn\d+', enurl) 
        btnname = matchobj.group()
        pri_key = btnname[-1]
        if btnname:
            query = Article.objects.get(pk=pri_key).delete()
            formset = ArticleFormSet(request.POST, request.FILES)
            if formset.is_valid():
                formset.save()
                formset = ArticleFormSet(queryset=Article.objects.all())
                return redirect('/?$')
        else:
            formset = ArticleFormSet(request.POST, request.FILES)
            if formset.is_valid():
                formset.save()
                return redirect('/?$')
    else:
        formset = ArticleFormSet()
    return render(request, "table/manage_articles.html", {"formset": formset})

{{ formset.management_form }}
    {% for form in formset %}
        {{ form.id }}
        {{ form.instance.id }}
        {{ form.DELETE }}
       <tr class="edt {% if forloop.first  %} shadow {% endif %}"
               {% if forloop.counter|divisibleby:"2" %}style="background-color: white"
               {% else %} style="background-color: #F2F2F2"
               {% endif %}>

           <td>  {{ form.title }} </td>
           <td>{{ form.priceMazut }} </td>
           <td>{{ form.priceSPBT }} </td>
           <td>{{ form.priceDTl }} </td>
           <td>{{ form.priceDTm }} </td>
           <td>{{ form.priceDTz }} </td>
           <td><input type="submit" name="del_btn{{ form.instance.id }}" value="Delete"/></td>
           <td class="last"></td>
       </tr>

Answer 1

def manage_articles(request):
    if not request.user.is_staff:
            return redirect('/')
    ArticleFormSet = modelformset_factory(Article, fields=('title', 'priceMazut', 'priceSPBT',
                                                           'priceDTl', 'priceDTm', 'priceDTz'))
    if request.method == 'POST':
        enurl = urllib.parse.urlencode(request.POST) 
        matchobj = re.search(r'del_btn\d+', enurl)
        if matchobj is not None:
            btnname = matchobj.group()
            pri_key = btnname[7:]
            if btnname:
                Article.objects.get(pk=pri_key).delete()
                formset = ArticleFormSet(request.POST, request.FILES)
                formset.save()
                return redirect('/?$')
        else:
            formset = ArticleFormSet(request.POST, request.FILES)
            if formset.is_valid():
                formset.save()
                return redirect('/?$')
    else:
        formset = ArticleFormSet()
    return render(request, "table/manage_articles.html", {"formset": formset})