AttributeError: el objeto 'módulo' no tiene el atributo 'urls'

ERROR Python 2.7 y Django 1.10:

AttributeError: 'module' object has no attribute 'urls' 

main / urls.py

from django.conf.urls import url, include
from django.contrib import admin
import article

urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^', include(article.urls))

]

article / urls.py

from django.conf.urls import url
from . import views

urlpatterns = [

    url(r'^

Estructura:

APP / main / urls.py

APP / article / urls.py

, views.basic_one, name='basic_one') ]

Estructura:

APP / main / urls.py

APP / article / urls.py

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