class_docstr: Base class for CSV file based :class:`pyalgotrade.barfeed.BarFeed`.
  
  .. note::
      This is a base class and should not be used directly.
class_docstr_tok: ["Base","class","for","CSV","file","based",":","class",":","`","pyalgotrade.barfeed.BarFeed","`",".","..","note",":",":","This","is","a","base","class","and","should","not","be","used","directly","."]
code: def __init__(self, frequency, maxLen=None):
      super(BarFeed, self).__init__(frequency, maxLen)
  
      self.__barFilter = None
      self.__dailyTime = datetime.time(0, 0, 0)
  
imports: import datetime
  import pytz
  import six
  from pyalgotrade.utils import dt
  from pyalgotrade.utils import csvutils
  from pyalgotrade.barfeed import membf
  from pyalgotrade import bar
label_desc: Use image node_id 1 to create a new BarFeed object from inherited base classes: membf with example: obj = BarFeed(frequency, maxLen)