old_contents: from __future__ import absolute_import
  from celery import shared_task
  
  
  @shared_task
  def join_chunks_task(flow_file):
      print 'starting join task',
      return flow_file._join_chunks()
  
  
  @shared_task
  def delete_chunks_task(flow_file):
      print 'starting delete task',
      return flow_file._delete_chunks()
new_contents: from __future__ import absolute_import
  from celery import shared_task
  
  
  @shared_task
  def join_chunks_task(flow_file):
      print('starting join task'),
      return flow_file._join_chunks()
  
  
  @shared_task
  def delete_chunks_task(flow_file):
      print('starting delete task'),
      return flow_file._delete_chunks()
  
subject: support python3 print style