does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import

I got

does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import error .

I wrote in urls.py of child app

from django.conf.urls import url
from django.contrib.views import login,logout

urlpatterns = [
    url(r'^login/$', login,
        name='login'),
    url(r'^logout/$', logout, name='logout')
]

in urls.py of parent app,

from django.conf import settings
from django.conf.urls import include, url
from django.conf.urls.static import static
from django.contrib import admin

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^accounts/', include('accounts.urls')),
    url(r'^api/', include('UserToken.urls')),
    url(r'^UserDataAPI/', include('UserDataAPI.urls', namespace='UserDataAPI')),
]
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

I am thinking urls.py of child or parent app,but I do not know how to fix it. What should I do?

Answer

Your import is incorrect. The views.py containing login and logout is in the django.contrib.auth app:

from django.contrib.auth.views import login, logout