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reverse('ding:sign_in')
reference: https://docs.djangoproject.com/en/1.6/topics/http/urls/#topics-http-reversing-url-namespaces
Make sure you know the difference between application namespace and instance namespace:
https://docs.djangoproject.com/en/1.6/topics/http/urls/#url-namespaces
I find that rarely both are needed (but of course there are plenty of use cases where they are).
Source:stackexchange.com