code: def df_multi():
      """MultiIndex dataframe fixture."""
      return pd.DataFrame(
          {
              ("name", "a"): {0: "Wilbur", 1: "Petunia", 2: "Gregory"},
              ("names", "aa"): {0: 67, 1: 80, 2: 64},
              ("more_names", "aaa"): {0: 56, 1: 90, 2: 50},
          }
      )
  
file_path: pyjanitor/tests/functions/test_explode_index.py
imports: import pandas
  import pytest
  from pandas.testing import assert_frame_equal
label_desc: Use image node_id 2 for calling a global function with example usage: df_multi() and returns: pd