code: def get_kline(self, symbol, period, size=150, _async=False):
          
          params = {'symbol': symbol, 'period': period, 'size': size}
  
          url = u.MARKET_URL + '/market/history/kline'
          return http_get_request(url, params, _async=_async)
docs: 获取KLine
          :param symbol
          :param period: 可选值：{1min, 5min, 15min, 30min, 60min, 1day, 1mon, 1week, 1year }
          :param size: 可选值： [1,2000]
          :return: