name 'urlpatterns' is not defined when doing translation (+= i18n_patterns) - django

Question

I want to add a language prefix in URL patterns just like the django documentation homepage. Following this example my urls.py looks like this:
from django.conf.urls import include, url
from django.conf.urls.i18n import i18n_patterns
from django.contrib import admin
from myapp import views
from myapp.views import MyFirstView, MySecondView
myapp_patterns = [
url(r'^$', views.CategoryView, name='index'),
url(r'^(?P<name>[a-zA-Z0-9_]+)/$', MyFirstView.as_view(), name='detail'),
url(r'^(?P<name>[a-zA-Z0-9_]+)/mysecond_view/$', MySecondView, name='mysecond_view')
]
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^categories/', include(myapp_patterns)),
url(r'^', views.LandingView),
]
This works but now when I add += i18n_patterns
urlpatterns += i18n_patterns [
url(r'^admin/', admin.site.urls),
url(r'^categories/', include(myapp_patterns)),
url(r'^', views.LandingView),
]
I get the error: NameError: name 'urlpatterns' is not defined
I did add the LocalMiddleware:
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
...
]
as well as this:
LANGUAGE_CODE = 'en-us'
USE_I18N = True
USE_L10N = True
LOCALE_PATHS = (
os.path.join(BASE_DIR, 'locale'),
)
I don't understand how urlpatterns all of the sudden is not defined anymore.
What am I doing wrong here?

Answer 1

Primarily because of +=. There's no previous definition of urlpatterns.
You should start of with assignment = to define it.