code: def notify_order(self, order):
      print("-- NOTIFY ORDER BEGIN")
      print(order)
      print("-- NOTIFY ORDER END")
      print("-- ORDER REMSIZE:", order.executed.remsize)
  
      if order.status == order.Completed:
          print("++ ORDER COMPLETED at data.len:", len(order.data))
          self.doop = -self.p.opbreak
  
file_path: backtrader/samples/volumefilling/volumefilling.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import os.path
  import time
  import sys
  import backtrader
label_desc: Use image node_id 1 for calling the St obj's underlying member method code with example usage: obj.notify_order(order) without return types