code: def __init__(self, datetimes, priority=None):
      super(NonRealtimeFeed, self).__init__()
      self.__datetimes = datetimes
      self.__event = observer.Event()
      self.__priority = priority
  
imports: import datetime
  import copy
  from six.moves import xrange
  from .None import common
  from pyalgotrade import observer
  from pyalgotrade import dispatcher
label_desc: Use image node_id 1 to create a new NonRealtimeFeed object from inherited base classes: observer with example: obj = NonRealtimeFeed(datetimes, priority)