.env file usage๏ƒ

When hosting services in Docker, we use the environment directive in compose.yml or compose.override.yml to set environment variables for the Docker container. This is not available for Python scripts run on the host machine. Instead, we use an .env file to set environment variables instead:

### .env ###

MONGO_URL_PUBLIC=localhost
MONGO_PORT_PUBLIC=27017

REDIS_URL_PUBLIC=localhost
REDIS_PORT_PUBLIC=6379

### conf.py ###

from dotenv import find_dotenv, load_dotenv

env_get = os.environ.get

# If not Docker, load environment variables manually
if not os.path.isfile('/.dockerenv'):
    load_dotenv(find_dotenv('.env', True))

# The rest of the file loads environment variables into Python, regardless of their source

See the Docker documentation on the precedence rules regarding environment variables.