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It will be a better idea, to create your graph and store it in Media folder. You can then set your MEDIA_URL and MEDIA_ROOT. Django does not serve static file directly from the folders.
You can then configure your url.py to
from django.conf import settings
from django.conf.urls.static import static
urlpatterns = patterns('',
# ... the rest of your URLconf goes here ...
) + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
Source:stackexchange.com