docstr: Cancel a single order
  
  Parameters
  ----------
  order_id : int
      The id of the order
  
  relay_status : bool
      Whether or not to record the status of the order
docstr_tok: ["Cancel","a","single","order","Parameters","--","--","--","--","--","order_id",":","int","The","id","of","the","order","relay_status",":","bool","Whether","or","not","to","record","the","status","of","the","order"]
code: def cancel(self, order_id, relay_status=True):
      """Cancel a single order
  
      Parameters
      ----------
      order_id : int
          The id of the order
  
      relay_status : bool
          Whether or not to record the status of the order
      """
      raise NotImplementedError("cancel")
  
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 5 for calling the Blotter obj's underlying member method code with example usage: obj.cancel(order_id, relay_status) without return types