code: def run_step(self, representer):
          
          assert representer, ("ObjectRepresenter instance required to run "
                               "ObjectRewriterStep.")
          rewriter = ObjectRewriter(self.context.get_formatted_iterable,
                                    representer)
          super().run_step(rewriter)
docs: Do the object in-out rewrite.
  
          Args:
              representer: A pypyr.filesystem.ObjectRepresenter instance.