code: def eof(self):
      return self.__nextPos >= len(self.__bars)
  
imports: import abc
  from pyalgotrade import bar
  from pyalgotrade.dataseries import bards
  from pyalgotrade import feed
  from pyalgotrade import dispatchprio
label_desc: Use image node_id 9 for calling the OptimizerBarFeed obj's underlying member method code with example usage: obj.eof() and returns: unknown