Example settings.py

import os
from myapp import config
from django.utils.translation import ugettext_lazy as _

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = config.SECRET_KEY

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = config.DEBUG

ALLOWED_HOSTS = config.ALLOWED_HOSTS

# Application definition

INSTALLED_APPS = (
    'modeltranslation',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'whitenoise.runserver_nostatic',
    'django.contrib.staticfiles',
    'myapp',
)

MIDDLEWARE = (
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    # 'django_country.middleware.CountryMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
)

ROOT_URLCONF = 'project.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
                'django_settings_export.settings_export',
            ],
        },
    },
]

WSGI_APPLICATION = 'project.wsgi.application'

# Settings for email sending
try:
    EMAIL_HOST = os.environ['EMAIL_HOST']
except KeyError:
    EMAIL_HOST = config.EMAIL_HOST
try:
    EMAIL_HOST_PASSWORD = os.environ['EMAIL_HOST_PASSWORD']
except KeyError:
    EMAIL_HOST_PASSWORD = config.EMAIL_HOST_PASSWORD
try:
    EMAIL_HOST_USER = os.environ['EMAIL_HOST_USER']
except KeyError:
    EMAIL_HOST_USER = config.EMAIL_HOST_USER
try:
    EMAIL_USE_TLS = os.environ['EMAIL_USE_TLS'] or False
except KeyError:
    EMAIL_USE_TLS = config.EMAIL_USE_TLS
try:
    EMAIL_PORT = os.environ['EMAIL_PORT']
except KeyError:
    EMAIL_PORT = config.EMAIL_PORT

try:
    DKIM_SELECTOR = os.environ['DKIM_SELECTOR']
except KeyError:
    DKIM_SELECTOR = config.DKIM_SELECTOR
try:
    DKIM_DOMAIN = os.environ['DKIM_DOMAIN']
except KeyError:
    DKIM_DOMAIN = config.DKIM_DOMAIN
try:
    DKIM_PRIVATE_KEY = os.environ['DKIM_PRIVATE_KEY']
except KeyError:
    DKIM_PRIVATE_KEY = config.DKIM_PRIVATE_KEY
if DKIM_PRIVATE_KEY:
    EMAIL_BACKEND = 'email_backend.DKIMBackend'

try:
    SITE_HOST = os.environ['SITE_HOST']
except KeyError:
    SITE_HOST = config.SITE_HOST

DEFAULT_FROM_EMAIL = 'info@project.net'
DEFAULT_ACCOUNT_EMAIL = 'accounts@project.net'

# Database

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

# Bring database configuration from database url if dj_database_url is installed
try:
    import dj_database_url
    db_url = config.DATABASE_URL
    DATABASES['default'] = dj_database_url.config(default=db_url)
except:
    pass


# Internationalization

LANGUAGE_CODE = 'en'

LANGUAGES = (
    ('en', _('English')),
)

LOCALE_PATHS = (
    os.path.join(BASE_DIR, 'locale/'),
)

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

USE_S3 = config.USE_S3

if USE_S3:  # Only use Amazon S3 in production

    # Amazon AWS Specific settings:

    AWS_HEADERS = {  # see http://developer.yahoo.com/performance/rules.html#expires
            'Expires': 'Thu, 31 Dec 2099 20:00:00 GMT',
            'Cache-Control': 'max-age=94608000',
        }

    AWS_STORAGE_BUCKET_NAME = config.AWS_STORAGE_BUCKET_NAME
    AWS_ACCESS_KEY_ID = config.AWS_ACCESS_KEY_ID
    AWS_SECRET_ACCESS_KEY = config.AWS_SECRET_ACCESS_KEY

    # Tell django-storages that when coming up with the URL for an item in S3 storage, keep
    # it simple - just use this domain plus the path. (If this isn't set, things get complicated).
    # This controls how the `static` template tag from `staticfiles` gets expanded, if you're using it.
    # We also use it in the next setting.
    AWS_S3_CUSTOM_DOMAIN = '%s.s3.amazonaws.com' % AWS_STORAGE_BUCKET_NAME

    MEDIAFILES_LOCATION = 'media'
    MEDIA_URL = "https://%s/%s/" % (AWS_S3_CUSTOM_DOMAIN, MEDIAFILES_LOCATION)
    DEFAULT_FILE_STORAGE = 'custom_storages.MediaStorage'

# Braintree settings
try:
    BRAINTREE_MERCHANT_ID = os.environ['BRAINTREE_MERCHANT_ID']
except KeyError:
    BRAINTREE_MERCHANT_ID = config.BRAINTREE_MERCHANT_ID
try:
    BRAINTREE_PUBLIC_KEY = os.environ['BRAINTREE_PUBLIC_KEY']
except KeyError:
    BRAINTREE_PUBLIC_KEY = config.BRAINTREE_PUBLIC_KEY
try:
    BRAINTREE_PRIVATE_KEY = os.environ['BRAINTREE_PRIVATE_KEY']
except KeyError:
    BRAINTREE_PRIVATE_KEY = config.BRAINTREE_PRIVATE_KEY
try:
    BRAINTREE_SANDBOX_MODE = os.environ['BRAINTREE_SANDBOX_MODE']
except KeyError:
    BRAINTREE_SANDBOX_MODE = config.BRAINTREE_SANDBOX_MODE
try:
    PAYMENT_HOST = os.environ['BRAINTREE_PAYMENT_HOST']
except KeyError:
    PAYMENT_HOST = config.BRAINTREE_PAYMENT_HOST

PAYMENT_USES_SSL = False
PAYMENT_MODEL = 'mysite.Payment'
PAYMENT_VARIANTS = {'default': ('payments.dummy.DummyProvider', {})}
PAYMENT_VARIANTS = {'default': ('payments.braintree.BraintreeProvider', {'merchant_id': BRAINTREE_MERCHANT_ID,
                                                                         'public_key': BRAINTREE_PUBLIC_KEY,
                                                                         'private_key': BRAINTREE_PRIVATE_KEY,
                                                                         'sandbox': BRAINTREE_SANDBOX_MODE})}


# Static files (CSS, JavaScript, Images)

try:
    STATIC_ROOT = os.environ['STATIC_ROOT']kijk
except KeyError:
    STATIC_ROOT = config.STATIC_ROOT

STATIC_URL = '/static/'

MEDIA_DIR_NAME = 'media'

MEDIA_ROOT = os.path.join(BASE_DIR, MEDIA_DIR_NAME)
if not USE_S3:  # Use local filesystem in development mode
    MEDIA_URL = '/media/'

try:
    GOOGLE_MAPS_V3_APIKEY = config.GOOGLE_MAPS_V3_APIKEY
except:
    GOOGLE_MAPS_V3_APIKEY = ''

# For enabling HTTPS in the production server
PRODUCTION_SERVER = False
try:
    if config.PRODUCTION_SERVER == True:
        SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
        PRODUCTION_SERVER = True
except:
    pass