class_docstr: Abstract base class for renderers, defining the interface that they must implement.
code: def save(self, filename: str, transparent: bool = False) -> None:
      pass
  
file_path: catboost/contrib/python/contourpy/contourpy/util/renderer.py
imports: from __future__ import annotations
  from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING, Any
  import numpy
label_desc: Use image node_id 6 for calling the Renderer obj's underlying member method code with example usage: obj.save(filename, transparent) without return types