wifi-with-me/wifiwithme/core/urls.py

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

def prefix(url_pattern):
    """
    :param url: url pattern, without leading "^"
    """
    return '^{}{}'.format(settings.URL_PREFIX, url_pattern)

urlpatterns = [
    url(prefix(r'admin/'), admin.site.urls),
    url(prefix(r'map/'), include('contribmap.urls')),
]