Check out example codes for "django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.". It will help you in understanding the concepts better.
Code Example 1
url(r'^reviews/', include(('reviews.urls', 'reviews'), namespace='reviews')),
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