code: def notify_store(self, msg, *args, **kwargs):
      print("*" * 5, "STORE NOTIF:", msg)
  
file_path: backtrader/samples/vctest/vctest.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
  from backtrader.utils import flushfile
  from backtrader.utils.py3 import string_types
label_desc: Use image node_id 3 for calling the TestStrategy obj's underlying member method code with example usage: obj.notify_store(msg) without return types