Nrthugu

I have the next url.py:

from django.urls import path

from . import views

from django.conf.urls import url, include

from django.contrib.auth.decorators import login_required

from two_factor.urls import urlpatterns as tf_urls



urlpatterns = [

    path('', views.index, name='index'),

    url(r'', include(tf_urls)),

    url(r'datasets/$', login_required(views.mostrar_Model_Dataset), name="mostrar_Model_Dataset"),

    url(r'datasets/(d+)/$', login_required(views.mostrar_Model_Dataset), name="mostrar_Model_Dataset_i"),

]

And this view:

def mostrar_Model_Dataset(request, Model_Dataset_id=None):

   conjuntos_datos = Model_Dataset.objects.all()

   ...

   context =  {"conjuntos_datos": conjuntos_datos,

            "Dataset_id": Dataset_id,

            "datos": paginated_data,

            "fixed_pager": page_range,}

   return render(request, 'datasets.html', context)

If I try to access to http://localhost/twitterprojects/datasets/1 or http://localhost/twitterprojects/datasets/20 or http://localhost/twitterprojects/datasets/256 this work fine, but when I try to access to http://localhost/twitterprojects/datasets/ (without argument) I receive the next message:

Exception Type: NoReverseMatch
Exception Value: Reverse for 'mostrar_Model_Dataset' with arguments '(1,)' not found. 1 pattern(s) tried: ['twitterprojects/datasets/$']

some idea?