code: def execute_cancel_policy(self, event):
      raise NotImplementedError("execute_cancel_policy")
  
file_path: zipline/zipline/finance/blotter/blotter.py
imports: from abc import ABCMeta, abstractmethod
  from six import with_metaclass
  from zipline.extensions import extensible
  from zipline.finance.cancel_policy import NeverCancel
label_desc: Use image node_id 7 for calling the Blotter obj's underlying member method code with example usage: obj.execute_cancel_policy(event) without return types