code: def p_duration_duration_unit(self, p):
          'duration : DURATION_UNIT'
          logger.debug('duration = 1 of duration unit %s', p[1])
          p[0] = Duration.from_quantity_unit(1, p[1]f p_duration_duration_unit(self, p):
          'duration : DURATION_UNIT'
          logger.debug('duration = 1 of duration unit %s', p[1])
          p[0] = Duration.from_quantity_unit(1, p[1])
docs: duration : DURATION_UNIT