code: def unpublish(self, registry=None):
          ''' Try to un-publish the current version. Return a description of any
              errors that occured, or None if successful.
          '''
          return registry_access.unpublish(
              self.getRegistryNamespace(),
              self.getName(),
              self.getVersion(),
              registry=registry
          f unpublish(self, registry=None):
          ''' Try to un-publish the current version. Return a description of any
              errors that occured, or None if successful.
          '''
          return registry_access.unpublish(
              self.getRegistryNamespace(),
              self.getName(),
              self.getVersion(),
              registry=registry
          )
docs: Try to un-publish the current version. Return a description of any
              errors that occured, or None if successful.