code: def nvmlDeviceGetHandleByIndex(self, index):
      return self._mock_data[index]
  
imports: import pytest
  from typing import List
  from unittest.mock import patch
  import ray._private.thirdparty.pynvml
label_desc: Use image node_id 6 for calling the PyNVMLMock obj's underlying member method code with example usage: obj.nvmlDeviceGetHandleByIndex(index) and returns: self