[Answered ]-Django namespace NoReverseMatch

In your code, change the reverse('notecards:index', ()) to reverse('notecards:index'). The signature of reverse is

reverse(viewname, urlconf=None, args=None, kwargs=None, prefix=None, current_app=None)

You could see that urlconf mistakenly takes () instead of args taking it.

Moreover, have a look at the django.shortcuts.resolve_url, it’s easier for normal use.