code: def multi():
      """fixture for MultiIndex column"""
      columns = pd.MultiIndex.from_tuples(
          [("first", "extra"), ("second", "extra"), ("A", "cat")],
          names=["exp", "animal"],
      )
  
      data = np.array(
          [
              ["bar", "one", 0.10771469563752678],
              ["bar", "two", -0.6453410828562166],
              ["baz", "one", 0.3210232406192864],
              ["baz", "two", 2.010694653300755],
          ],
          dtype=object,
      )
  
      return pd.DataFrame(data, columns=columns)
  
imports: import numpy
  import pandas
  import pytest
  from pandas.testing import assert_frame_equal
label_desc: Use image node_id 37 for calling a global function with example usage: multi() and returns: pd