def save(self, filename=None):
        filename = Path(filename) if filename is not None else self.filename
        with filename.open("w") as f:
            f.write(self.yaml)
def run(self):

        logger.info('starting webapp')
        logger.info('hosted at %s' % settings.WEBAPP_IP)
        logger.info('running on port %d' % settings.WEBAPP_PORT)

        app.run(settings.WEBAPP_IP, settings.WEBAPP_PORT)