code: def p_speed_conversion(self, p):
          'speed : speed IN speed_unit'
          logger.debug('speed = speed %s in speed unit %s', p[1], p[3])
          information_unit, duration = p[3]
          p[0] = '{0: {1}}'.format(p[1],
                                   '{0}/{1}'.format(information_unit, duration)f p_speed_conversion(self, p):
          'speed : speed IN speed_unit'
          logger.debug('speed = speed %s in speed unit %s', p[1], p[3])
          information_unit, duration = p[3]
          p[0] = '{0: {1}}'.format(p[1],
                                   '{0}/{1}'.format(information_unit, duration))
docs: speed : speed IN speed_unit