code: def naturalearth_cities() -> str:
      # skip if data missing, unless on github actions
      if os.path.isfile(_NATURALEARTH_CITIES) or os.getenv(
          "GITHUB_ACTIONS"
      ):
          return _NATURALEARTH_CITIES
      else:
          pytest.skip("Naturalearth cities dataset not found")
  
file_path: geopandas/geopandas/conftest.py
imports: import os.path
  import pytest
  import geopandas
  from geopandas.tests.util import _NYBB, _NATURALEARTH_LOWRES, _NATURALEARTH_CITIES
label_desc: Use image node_id 3 for calling a global function with example usage: naturalearth_cities() and returns: _NATURALEARTH_CITIES