code: def multiindex():
      """pytest fixture."""
      arrays = [
          ["bar", "bar", "baz", "baz", "foo", "foo", "qux", "qux"],
          pd.Categorical(
              ["one", "two", "one", "two", "one", "two", "one", "two"]
          ),
      ]
      index = pd.MultiIndex.from_arrays(
          arrays, names=["first", "second"]
      )
      return pd.DataFrame(np.random.randn(8, 4), index=index)
  
imports: import datetime
  import re
  import numpy
  import pandas
  import pytest
  from pandas.testing import assert_frame_equal
label_desc: Use image node_id 3 for calling a global function with example usage: multiindex() and returns: pd