Flask-Env 2.0.0

Python 2

from flask import Flask
from flask_env import MetaFlaskEnv


class Configuration(object):
    __metaclass__ = MetaFlaskEnv

    DEBUG = False
    PORT = 5000


app = Flask(__name__)
app.config.from_object(Configuration)

Python 3

from flask import Flask
from flask_env import MetaFlaskEnv


class Configuration(metaclass=MetaFlaskEnv):
    DEBUG = False
    PORT = 5000


app = Flask(__name__)
app.config.from_object(Configuration)

Overriding environment variables

# Export environment variable for shell session
export DEBUG=true

# Set explicitly for a specific command execution
PORT=8000 python app.py

Setting configuration values

You can set the flask-env configuration settings directly on your Flask configuration object.

from flask_env import MetaFlaskEnv


class Configuration(metaclass=MetaFlaskEnv):
    ENV_PREFIX = 'MYAPP_'
    ENV_LOAD_ALL = False