code: def fill_df():
      """pytest fixture"""
      return pd.DataFrame(
          dict(
              group=(1, 2, 1, 2),
              item_id=(1, 2, 2, 3),
              item_name=("a", "a", "b", "b"),
              value1=(1, np.nan, 3, 4),
              value2=range(4, 8),
          )
      )
  
imports: from string import ascii_lowercase
  import numpy
  import pandas
  import pytest
  from hypothesis import given, settings
  from pandas.testing import assert_frame_equal
  from janitor.testing_utils.strategies import categoricaldf_strategy
label_desc: Use image node_id 3 for calling a global function with example usage: fill_df() and returns: pd