code: def df1():
      res = DataFrame(
          [
              [1.067683, -1.110463, 0.20867],
              [-1.321405, 0.368915, -1.055342],
              [-0.807333, 0.08298, -0.873361],
          ]
      )
      res.columns = [list("ABC"), list("abc")]
      res.columns.names = ["CAP", "low"]
      return res
  
imports: import re
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, date_range, lreshape, melt, wide_to_long
  import pandas._testing
label_desc: Use image node_id 2 for calling a global function with example usage: df1() and returns: res