code: def deal_with_changeset_stack_policy(self, fqn, stack_policy):
          
          if stack_policy:
              kwargs = generate_stack_policy_args(stack_policy)
              kwargs["StackName"] = fqn
              logger.debug("Setting stack policy on %s.", fqn)
              self.cloudformation.set_stack_policy(**kwargs)
docs: Set a stack policy when using changesets.
  
          ChangeSets don't allow you to set stack policies in the same call to
          update them. This sets it before executing the changeset if the
          stack policy is passed in.
  
          Args:
              stack_policy (:class:`stacker.providers.base.Template`): A template
                  object representing a stack policy.