code: def __init__(self, rowParser, maxLen=None):
      super(BaseFeed, self).__init__(maxLen)
  
      self.__rowParser = rowParser
      self.__rowFilter = None
  
imports: import abc
  import datetime
  import six
  from pyalgotrade.utils import dt
  from pyalgotrade.utils import csvutils
  from pyalgotrade.feed import memfeed
label_desc: Use image node_id 1 to create a new BaseFeed object from inherited base classes: memfeed with example: obj = BaseFeed(rowParser, maxLen)