code: def dispatch(self):
      ret = True
      self.__event.emit(self.__datetimes.pop(0))
      return ret
  
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 7 for calling the RealtimeFeed obj's underlying member method code with example usage: obj.dispatch() and returns: ret