code: def doc_subst(snippets):
      """Substitute format strings in class or function docstring"""
  
      def decorator(cls_or_func):
          # Strip the snippets to avoid trailing new lines and whitespace
          stripped_snippets = {
              key: snippet.strip()
              for (key, snippet) in snippets.items()
          }
          cls_or_func.__doc__ = cls_or_func.__doc__.format(
              **stripped_snippets
          )
          return cls_or_func
  
      return decorator
  
label_desc: Use image node_id 1 for calling a global function with example usage: doc_subst(snippets) and returns: decorator, cls_or_func