code: def get_filename_for_block(
      self, block: Block, task_index: int, block_index: int
  ) -> str:
      file_id = f"{task_index:06}_{block_index:06}"
      return self._generate_filename(file_id)
  
file_path: ray/python/ray/data/datasource/filename_provider.py
imports: from typing import Any, Dict, Optional
  from ray.data.block import Block
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 2 for calling the _DefaultFilenameProvider obj's underlying member method code with example usage: obj.get_filename_for_block(block, task_index, block_index) and returns: self