class Apps(Settings):
    def DJANGO_APPS(self): return (
        'django.contrib.auth',
         ...
    )
    def THIRD_PARTY_APPS(self): return (
        'rest_framework',
        'south',
    )
    def OWN_APPS(self): return (
        'app1',
        'app2',
    )
    def INSTALLED_APPS(self):
        return self.DJANGO_APPS() + self.THIRD_PARTY_APPS() + self.OWN_APPS()

from classsettings import Config

class REST_FRAMEWORK(Config):
    def DEFAULT_FILTER_BACKENDS(self): return (
        'rest_framework.filters.DjangoFilterBackend',
    )
    DEFAULT_RENDERER_CLASSES = ('rest_framework.renderers.YAMLRenderer',)

REST_FRAMEWORK = {
    'DEFAULT_FILTER_BACKENDS': (
        'rest_framework.filter.DjangoFilterBackend',
    ),
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.YAMLRenderer',
    )
}

from classsettings import Settings, from_env

class MySettingsGroup(Settings):
    # Will look for `EMAIL_HOST` key in `os.environ`
    # and use `smtp.gmail.com` if such key was not found
    @from_env
    def EMAIL_HOST(self): return 'smtp.gmail.com'

    # Will raise Django's `ImproperlyConfigured` exception
    # if such key was not found
    @from_env
    def SECRET_KEY(self): pass

    # Will look for specified key
    @from_env(key='CUSTOM_ENV_VAR_NAME')
    def variable(self): pass

    # Will apply `through` callable to result
    @from_env(through=dj_database_url.parse)
    def DATABASE_URL(self): return 'sqlite://'

from django.conf.urls import patterns, url

import views

urlpatterns = patterns('',
    url(r'^$', views.ProjectList.as_view(), name='projects_project_list'),

    url(r'^create/$', views.ProjectCreate.as_view(), name='projects_project_create'),
    url(r'^view/(?P<pk>\w+)/$', views.ProjectDetail.as_view(), name='projects_project_view'),
    url(r'^update/(?P<pk>\w+)/$', views.ProjectUpdate.as_view(), name='projects_project_update'),
    url(r'^delete/(?P<pk>\w+)/$', views.ProjectDelete.as_view(), name='projects_project_delete'),

    url('^accounts/(?P<pk>\d+)/$', 'project.accounts.profile_info', name='users_info')
    url('^accounts/edit/$', 'project.accounts.profile_edit', name='users_edit')
)

from classsettings.urls import Scope, url

import views

#
# Define url pattern, views or view name prefix:
#
# Views resolution:
#
#   some.module, 'string' => getattr(module, 'string')
#   'scope_str', 'string' => 'string'.format('scope_str', ...)
#
with Scope(regex='^', views=views, name='projects') as root:
    #
    # Strings are formatted with `str.format`:
    #
    #   value.format(value_of_parent_scope, **scope.context)
    #
    # Additional context variables can be defined and used with `{variable}`
    with Scope(name='{}_project', pk=r'(?P<pk>\w+)') as project:
        # Also supported
        project['pk'] = r'(?P<pk>\w+)'

        # For CBV `.as_view()` is called automatically
        url('{}$', 'ProjectList', name='{}_list')  # url => '^$', name => 'projects_project_list' 
        url('{}create/$', 'ProjectCreate', name='{}_create')
        url('{}view/{pk}/$', 'ProjectDetail', name='{}_detail')
        url('{}update/{pk}/$', 'ProjectUpdate', name='{}_update')
        url('{}delete/{pk}/$', 'ProjectDelete', name='{}_delete')

    with Scope(regex='{}accounts/', views='project.accounts', name='users',
               user_id=r'(?P<pk>\d+)'):
        url('{}{user_id}?/$', '{}.profile_info', name='{}_info')
        url('{}edit/$', '{}.profile_edit', name='{}_edit')

urlpatterns = root.urls