code: def reset_category(self, category, metric_slugs):
          
          key = self._category_key(category)
          if len(metric_slugs) == 0:
              # If there are no metrics, just remove the category
              self.delete_category(category)
          else:
              # Save all the slugs in the category, and save the category name
              self.r.sadd(key, *metric_slugs)
              self.r.sadd(self._categories_key, category)
docs: Resets (or creates) a category containing a list of metrics.
  
          * ``category`` -- A category name
          * ``metric_slugs`` -- a list of all metrics that are members of the
              category.