code: def __init__(self, cancel_policy=None):
      self.cancel_policy = (
          cancel_policy if cancel_policy else NeverCancel()
      )
      self.current_dt = None
  
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 1 to create a new Blotter object from inherited base classes:  with example: obj = Blotter(cancel_policy)