code: def replace(self, collection_name, old, new):
          
          self.agency.before_replace(self, old, new)
          updated = self.transform(
              [collection_name],
              lambda c: c.replace(old, new),
          )
          return updated
docs: Replace an existing object with a new version of it.
  
          :param unicode collection_name: The name of the collection in which to
              replace an object.
  
          :param IObject old: A description of the object being replaced.
  
          :param IObject new: A description of the object to take the place of
              ``old``.
  
          :return _KubernetesState: A new state based on the current state but
              also containing ``obj``.