create a logger to stdout

def _create_stdout_logger():
    """ create a logger to stdout """
    log = logging.getLogger(__name__)
    out_hdlr = logging.StreamHandler(sys.stdout)
    out_hdlr.setFormatter(logging.Formatter('%(message)s'))
    out_hdlr.setLevel(logging.INFO)
    log.addHandler(out_hdlr)
    log.setLevel(logging.INFO)