def add_env(parser):
    """Add an `env` flag to the _parser_."""
    parser.add_argument(
        '-e', '--env', choices=ENVS, default=os.getenv('ENV', default='dev'), help='Deploy environment, overrides $ENV')
def add_env ( parser ) : parser . add_argument ( '-e' , '--env' , choices = ENVS , default = os . getenv ( 'ENV' , default = 'dev' ) , help = 'Deploy environment, overrides $ENV' )
Add an `env` flag to the _parser_.