django inverso provoca importazione circolare

Question

ho questo nel mio progetto urlconf photocheck.urls:

urlpatterns = patterns('', 

    url(r'^admin/docs/', include('django.contrib.admindocs.urls')), 
    url(r'^admin/', include(admin.site.urls)), 
    url(r'^rest/', include('core.urls')), 
    url(r'^shotmaker/', include('shotmaker.urls')), 
    url(r'^report/', include('report.urls')), 
    url(r'^users/', include('users.urls')), 

) + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT) 

questo è il mio core app urlconf:

router.register(r'cameras', views.CameraViewSet) 
router.register(r'lamps', views.LampViewSet) 
router.register(r'snapshots', views.SnapshotViewSet) 

urlpatterns = patterns(
    'core.views', 
    url(r'', include(router.urls)) 
) 

questo è shotmaker urlconf:

urlpatterns = patterns(
    'shotmaker.views', 

    url(r'^$', views.CameraList.as_view(), name='camera_list'), 
    url(r'^camera/(?P<pk>[-\w]+)/$', views.CameraDetail.as_view(), name='camera_detail'), 
    url(r'^save_preview_image/(?P<pk>[-\w]+)/$', views.save_preview_image), 
    url(r'^get_position/(?P<pk>[-\w]+)/$', views.get_position), 
    url(r'^set_position/(?P<pk>[-\w]+)/$', views.set_position), 
    url(r'^update_calibrating_image/(?P<pk>[-\w]+)/$', views.update_calibrating_image), 
    url(r'^save_preview_get_position/(?P<pk>[-\w]+)/$', views.save_preview_get_position), 


) 

e report urlconf

urlpatterns = patterns(
    'report.views', 
    url(r'^$', views.LampReportView.as_view(), name='lamp_report'), 
) 

e users urlconf

urlpatterns = patterns('', 
url(r'^login/$', views.MyLoginView.as_view(), name="login"), 
url(r'^logout/$', LogoutView.as_view(), name="logout"), 
) 

ora quando faccio

reverse('lamp_report') 

ottengo questo:

Traceback (most recent call last): 
     File "<console>", line 1, in <module> 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 546, in reverse 
     return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)) 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 410, in _reverse_with_prefix 
     self._populate() 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 269, in _populate 
     for pattern in reversed(self.url_patterns): 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 367, in url_patterns 
     patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 361, in urlconf_module 
     self._urlconf_module = import_module(self.urlconf_name) 
     File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module 
     __import__(name) 
     File "/Users/1111/_gost/photo/photo-monitoring/photocheck/urls.py", line 15, in <module> 
     url(r'^users/', include('users.urls')), 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/conf/urls/__init__.py", line 28, in include 
     urlconf_module = import_module(urlconf_module) 
     File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module 
     __import__(name) 
     File "/Users/1111/_gost/photo/photo-monitoring/users/urls.py", line 4, in <module> 
     import views 
     File "/Users/1111/_gost/photo/photo-monitoring/users/views.py", line 6, in <module> 
     class MyLoginView(LoginView): 
     File "/Users/1111/_gost/photo/photo-monitoring/users/views.py", line 8, in MyLoginView 
     success_url = reverse('lamp_report') 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 546, in reverse 
     return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)) 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 410, in _reverse_with_prefix 
     self._populate() 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 269, in _populate 
     for pattern in reversed(self.url_patterns): 
     File "/Users/1111/.virtualenvs/gost_photo/lib/python2.7/site-packages/django/core/urlresolvers.py", line 376, in url_patterns 
     raise ImproperlyConfigured(msg.format(name=self.urlconf_name)) 
    ImproperlyConfigured: The included urlconf 'photocheck.urls' 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. 

così dove è l'importazione circolare qui? e come posso evitarlo?

Answer 1

Utilizzare reverse_lazy() anziché reverse().

Answer 2

Ho ricevuto lo stesso errore e risolto ma solo reverse_lazy() non è sufficiente, utilizzare reverse_lazy() come reverse_lazy('app_name:url_name').