code: def df_cities():
      return gpd.read_file(
          os.path.join(
              test_sets_directory,
              "populated places",
              "ne_10m_populated_places_simple_bigcities.geojson",
          )
      )
  
file_path: Pandas-Bokeh/Tests/test_GeoPandasBokeh.py
imports: import os
  import sys
  import pytest
  import pandas_bokeh
label_desc: Use image node_id 2 for calling a global function with example usage: df_cities() and returns: gpd