code: def find_components_without_annotation(model, components):
      
      return [elem for elem in getattr(model, components) if
              elem.annotation is None or len(elem.annotation) == 0]
docs: Find model components with empty annotation attributes.
  
      Parameters
      ----------
      model : cobra.Model
          A cobrapy metabolic model.
      components : {"metabolites", "reactions", "genes"}
          A string denoting `cobra.Model` components.
  
      Returns
      -------
      list
          The components without any annotation.