code: def get_non_default_python(self) -> str:
      for version in PYTHON_VERSIONS.keys():
          if version != DEFAULT_PYTHON_VERSION:
              return version
  
file_path: ray/ci/ray_ci/test_base.py
imports: import os
  import unittest
  from unittest.mock import patch
  from ci.ray_ci.builder_container import PYTHON_VERSIONS
  from ci.ray_ci.builder import DEFAULT_PYTHON_VERSION
label_desc: Use image node_id 3 for calling the RayCITestBase obj's underlying member method code with example usage: obj.get_non_default_python() and returns: version