Configurações de projetos django que usa variáveis de ambiente para armazenar os valores. Recomendável para Heroku principalmente.

settings.py

# -*- coding: utf-8 -*-

import os

import dj_database_url

from unipath import Path

PROJECT_PATH = Path(__file__).parent

DEBUG = os.environ.get('DEBUG', False)
TEMPLATE_DEBUG = DEBUG

ADMINS = (
    # ('Your Name', '[email protected]'),
)

MANAGERS = ADMINS

DEFAULT_FROM_EMAIL = os.environ.get('DEFAULT_FROM_EMAIL', '')
if 'True' == os.environ.get('SEND_MAIL', 'False'):
    EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
    EMAIL_HOST = os.environ.get('EMAIL_HOST', 'localhost')
    EMAIL_HOST_USER = os.environ.get('EMAIL_HOST_USER', '')
    EMAIL_HOST_PASSWORD = os.environ.get('EMAIL_HOST_PASSWORD', '')
    EMAIL_PORT = os.environ.get('EMAIL_PORT', 0)
    EMAIL_USE_TLS = os.environ.get('EMAIL_USE_TLS', False)
else:
    EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'

DATABASES = {'default': dj_database_url.config(default='sqlite:///' + PROJECT_PATH.child('database.db'))}

# Hosts/domain names that are valid for this site; required if DEBUG is False
# See https://docs.djangoproject.com/en/1.5/ref/settings/#allowed-hosts
ALLOWED_HOSTS = ['localhost', '{{ project_name }}.herokuapp.com', 'example.com']

# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# In a Windows environment this must be set to your system time zone.
TIME_ZONE = 'America/Sao_Paulo'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'pt-br'

SITE_ID = 1

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale.
USE_L10N = True

# If you set this to False, Django will not use timezone-aware datetimes.
USE_TZ = True

# Absolute filesystem path to the directory that will hold user-uploaded files.
# Example: "/var/www/example.com/media/"
MEDIA_ROOT = ''

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash.
# Examples: "http://example.com/media/", "http://media.example.com/"
MEDIA_URL = ''

# Absolute path to the directory static files should be collected to.
# Don't put anything in this directory yourself; store your static files
# in apps' "static/" subdirectories and in STATICFILES_DIRS.
# Example: "/var/www/example.com/static/"
STATIC_ROOT = PROJECT_PATH.child('public')

# URL prefix for static files.
# Example: "http://example.com/static/", "http://static.example.com/"
STATIC_URL = '/static/'

# Additional locations of static files
STATICFILES_DIRS = (
    # Put strings here, like "/home/html/static" or "C:/www/django/static".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    PROJECT_PATH.child('static'),
)

# List of finder classes that know how to find static files in
# various locations.
STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
#    'django.contrib.staticfiles.finders.DefaultStorageFinder',
)

# Make this unique, and don't share it with anybody.
SECRET_KEY = 'xev@hx#9)h)z9q4(%te(b(jy1neo@7ct_lkb71ajjufnx46=^q'

# List of processors used by RequestContext to populate the context.
# Each one should be a callable that takes the request object as its
# only parameter and returns a dictionary to add to the context.
TEMPLATE_CONTEXT_PROCESSORS = (
    'django.contrib.auth.context_processors.auth',
    'django.core.context_processors.debug',
    'django.core.context_processors.i18n',
    'django.core.context_processors.media',
    'django.core.context_processors.static',
    'django.core.context_processors.tz',
    'django.core.context_processors.request',
    'django.contrib.messages.context_processors.messages',
)

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
#     'django.template.loaders.eggs.Loader',
)

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    # Uncomment the next line for simple clickjacking protection:
    # 'django.middleware.clickjacking.XFrameOptionsMiddleware',
)

ROOT_URLCONF = '{{ project_name }}.urls'

# Python dotted path to the WSGI application used by Django's runserver.
WSGI_APPLICATION = '{{ project_name }}.wsgi.application'

TEMPLATE_DIRS = (
    # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    PROJECT_PATH.child('templates'),
)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # 'django.contrib.admin',
    # 'django.contrib.admindocs',

    'gunicorn',
    'south',
    'storages',
    'crispy_forms',
)

# A sample logging configuration. The only tangible logging
# performed by this configuration is to send an email to
# the site admins on every HTTP 500 error when DEBUG=False.
# See http://docs.djangoproject.com/en/dev/topics/logging for
# more details on how to customize your logging configuration.
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        }
    },
    'handlers': {
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler'
        }
    },
    'loggers': {
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': True,
        },
    }
}

# contrib.auth
LOGIN_REDIRECT_URL = '/'

if DEBUG is False:
    DEFAULT_FILE_STORAGE = '{{ project_name }}.s3utils.MediaRootS3BotoStorage'
    STATICFILES_STORAGE = '{{ project_name }}.s3utils.StaticRootS3BotoStorage'

    AWS_ACCESS_KEY_ID = os.environ.get('AWS_ACCESS_KEY_ID', '')
    AWS_SECRET_ACCESS_KEY = os.environ.get('AWS_SECRET_ACCESS_KEY', '')
    AWS_STORAGE_BUCKET_NAME = os.environ.get('BUCKET_NAME', '')
    AWS_QUERYSTRING_AUTH = False
    AWS_HEADERS = { 'Expires': 'Thu, 15 Apr 2010 20:00:00 GMT', 'Cache-Control': 'max-age=86400', }

    MEDIA_URL = 'https://%s.s3.amazonaws.com/static/' % AWS_STORAGE_BUCKET_NAME
    STATIC_URL = 'https://%s.s3.amazonaws.com/static/' % AWS_STORAGE_BUCKET_NAME

# South
SOUTH_TESTS_MIGRATE = False

# Django Crispy Forms
CRISPY_TEMPLATE_PACK = 'bootstrap3'

# Tests
TEST_RUNNER = 'django_nose.NoseTestSuiteRunner'
NOSE_ARGS = [
    '--match=^(must|ensure|should|test|it_should)',
    '--where=%s' % PROJECT_PATH,
    '--id-file=%s' % PROJECT_PATH.child('.noseids'),
    '--all-modules',
    '--with-id',
    '--verbosity=2',
    '--nologcapture',
    '--rednose',
]