python_env_config.py

def env_var(key, default=None):
    """Retrieves env vars and makes Python boolean replacements"""
    val = os.environ.get(key, default)
    if val == 'True':
        val = True
    elif val == 'False':
        val = False
    elif val == 'None':
        val = None
    return val
    
ef read_env(env_file):
    """Pulled from Honcho code with minor updates, reads local default
    environment variables from a .env file located in the project root
    directory.
    """
    try:
        with open(env_file) as f:
            content = f.read()
    except IOError:
        content = ''
•
    for line in content.splitlines():
        m1 = re.match(r'\A([A-Za-z_0-9]+)=(.*)\Z', line)
        if m1:
            key, val = m1.group(1), m1.group(2)
            m2 = re.match(r"\A'(.*)'\Z", val)
            if m2:
                val = m2.group(1)
            m3 = re.match(r'\A"(.*)"\Z', val)
            if m3:
                val = re.sub(r'\\(.)', r'\1', m3.group(1))
            os.environ.setdefault(key, val)


# usage:
# do this once:

read_env(env_var("ENV_FILE", ".env"))

# then for any config you do, do:

CELERY_BROKER_URL = env_var('CELERY_BROKER_URL', 'amqp://guest@localhost//')