code: def stop(self):
      pass
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from backtrader.comminfo import CommInfoBase
  from backtrader.metabase import MetaParams
  from backtrader.utils.py3 import with_metaclass
  from .None import fillers
  from .None import fillers
label_desc: Use image node_id 4 for calling the BrokerBase obj's underlying member method code with example usage: obj.stop() without return types