parameters: (self, identifiers, ktype, start)
docstring: 预先加载当前日期之前的一段数据
          :param start:str
          :return:
docstring_summary: 预先加载当前日期之前的一段数据
          :param start:str
          :return:
docstring_tokens: 预先加载当前日期之前的一段数据 : param start : str : return :
function: def preloadDatas(self, identifiers, ktype, start):
          """
          预先加载当前日期之前的一段数据
          :param start:str
          :return:
          """
  
          for identifier in identifiers:
              try:
                  response = ts.get_k_data(code=identifier, ktype=ktype, start=start)
                  logger.info('preload datas:{0}'.format(identifier))
                  response.index = response.date
                  self.addBarsFromDataFrame(identifier, response)
  
              except:
                  logger.error("tushare time out")
function_tokens: def preloadDatas ( self , identifiers , ktype , start ) : for identifier in identifiers : try : response = ts . get_k_data ( code = identifier , ktype = ktype , start = start ) logger . info ( 'preload datas:{0}' . format ( identifier ) ) response . index = response . date self . addBarsFromDataFrame ( identifier , response ) except : logger . error ( "tushare time out" )