urls.py structure for Django music app - django

Question

I'm having some issues with the structuring of my Django app's urls.py file.
My project is a basic music player app. You begin by clicking a link for Music, followed by (for example) Artists, then you choose an artist, such as Weezer. The app then displays a list of albums and songs by that artist, rendered on the artist_name.html template by the views.artist_name function.
So far in the navigation of the app, the URL will look like http://localhost/music/artists/Weezer/.
My problem lies with the encoding of the next URL. If I choose the album The Blue Album by Weezer, I return the URL: http://localhost/music/artists/Weezer/The%20Blue%20Album.
This should render a template called artist_album_title.html using the views.artist_album_title function. Instead, it renders the new page using the same views.artist_name function as on the current page.
What seems to be happening is that the regex pattern for the ...Weezer/The%20Blue%20Album/ isn't matching with its related URL pattern in my urls.py file. Being new to Django (and with minimal experience with regex), I'm having a hard time determining what my urls.py file should look like for this kind of app.
Below is my urls.py file as it currently stands. Any help at all with my problem would be welcomed. Thanks guys.
from django.conf.urls import patterns, include
from music.views import home, music, artists, artist_name, artist_album_title
# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()
urlpatterns = patterns('',
(r'^admin/', include(admin.site.urls)),
(r'^$', home),
(r'^music/$', music),
(r'^music/artists/$', artists),
(r'^music/artists/([\w\W]+)/$', artist_name),
(r'^music/artists/([\w\W]+)/([\w\W]+)/$', artist_album_title),
)
artist_album_title function from views.py
def artist_album_title(request, album_title):
album_tracks = Track.objects.filter(album__title=album_title)
return render_to_response('artist_album_title.html', locals(), context_instance=RequestContext(request))

Answer 1

The problem with your urlpatterns is that the url /music/artists/Weezer/The%20Blue%20Album satisfies the first pattern so it doesn't go to the next one. This is because Django executes the patterns in the order they are specified.
In order for this to work you must switch the places of the two patterns like so:
urlpatterns = patterns('',
(r'^admin/', include(admin.site.urls)),
(r'^$', home),
(r'^music/$', music),
(r'^music/artists/$', artists),
(r'^music/artists/([\w\W]+)/([\w\W]+)/$', artist_album_title),
(r'^music/artists/([\w\W]+)/$', artist_name),
)
The best would be to use the following structure for your urls:
urlpatterns = patterns('',
(r'^admin/', include(admin.site.urls)),
(r'^$', home),
(r'^music/$', music),
(r'^music/artists/$', artists),
(r'^music/artists/(?P<artist_name>[\w\W]+)/(?P<album_title>[\w\W]+)/$', artist_album_title),
(r'^music/artists/(?P<artist_name>[\w\W]+)/$', artist_name),
)
and then your views definition will look like this:
def artist_album_title(request, artist_name,album_title):
and
def artist_name(request, artist_name):
you can read more about the named groups in the url in Django docs here
https://docs.djangoproject.com/en/dev/topics/http/urls/#named-groups