config.py 文件源码

def resolve_dotenv_file(path, stage=None):
    '''
    Resolve dotenv file and load environment vars if it exists.
    If stage parameter is provided, then stage specific .env file is resolved,
    for instance .env.production if stage=production etc.
    If stage is None, just .env file is resolved.
    '''
    filename = '.env' + ('' if not stage else '.{}'.format(stage))
    dotenv_path = os.path.join(path, filename)
    fallback_path = os.path.join(path, '.env')

    if fs.exists(dotenv_path):
        info('Resolving env file: {}'.format(cyan(dotenv_path)))
        dotenv.load_dotenv(dotenv_path)

    elif fs.exists(fallback_path):
        info('Resolving env file: {}'.format(cyan(fallback_path)))
        dotenv.load_dotenv(fallback_path)