code: def k(self, symbol='', begin=None, end=None):
          '''
          读取k线信息
  
          :param symbol:
          :param begin:
          :param end:
          :return: pd.dataFrame or None
          '''
          with self.client.connect(*self.bestip):
              data = self.client.get_k_data(symbol, begin, end)
              return datf k(self, symbol='', begin=None, end=None):
          '''
          读取k线信息
  
          :param symbol:
          :param begin:
          :param end:
          :return: pd.dataFrame or None
          '''
          with self.client.connect(*self.bestip):
              data = self.client.get_k_data(symbol, begin, end)
              return data
docs: 读取k线信息
  
          :param symbol:
          :param begin:
          :param end:
          :return: pd.dataFrame or None