code: def test_difference(self, sort):
      # diff
      period_rng = [
          "1/3/2000",
          "1/2/2000",
          "1/1/2000",
          "1/5/2000",
          "1/4/2000",
      ]
      rng1 = PeriodIndex(period_rng, freq="D")
      other1 = period_range("1/6/2000", freq="D", periods=5)
      expected1 = rng1
  
      rng2 = PeriodIndex(period_rng, freq="D")
      other2 = period_range("1/4/2000", freq="D", periods=5)
      expected2 = PeriodIndex(
          ["1/3/2000", "1/2/2000", "1/1/2000"], freq="D"
      )
  
      rng3 = PeriodIndex(period_rng, freq="D")
      other3 = PeriodIndex([], freq="D")
      expected3 = rng3
  
      period_rng = [
          "2000-01-01 10:00",
          "2000-01-01 09:00",
          "2000-01-01 12:00",
          "2000-01-01 11:00",
          "2000-01-01 13:00",
      ]
      rng4 = PeriodIndex(period_rng, freq="h")
      other4 = period_range("2000-01-02 09:00", freq="h", periods=5)
      expected4 = rng4
  
      rng5 = PeriodIndex(
          ["2000-01-01 09:03", "2000-01-01 09:01", "2000-01-01 09:05"],
          freq="min",
      )
      other5 = PeriodIndex(
          ["2000-01-01 09:01", "2000-01-01 09:05"], freq="min"
      )
      expected5 = PeriodIndex(["2000-01-01 09:03"], freq="min")
  
      period_rng = [
          "2000-02-01",
          "2000-01-01",
          "2000-06-01",
          "2000-07-01",
          "2000-05-01",
          "2000-03-01",
          "2000-04-01",
      ]
      rng6 = PeriodIndex(period_rng, freq="M")
      other6 = period_range("2000-04-01", freq="M", periods=7)
      expected6 = PeriodIndex(
          ["2000-02-01", "2000-01-01", "2000-03-01"], freq="M"
      )
  
      period_rng = ["2003", "2007", "2006", "2005", "2004"]
      rng7 = PeriodIndex(period_rng, freq="Y")
      other7 = period_range("1998-01-01", freq="Y", periods=8)
      expected7 = PeriodIndex(["2007", "2006"], freq="Y")
  
      for rng, other, expected in [
          (rng1, other1, expected1),
          (rng2, other2, expected2),
          (rng3, other3, expected3),
          (rng4, other4, expected4),
          (rng5, other5, expected5),
          (rng6, other6, expected6),
          (rng7, other7, expected7),
      ]:
          result_difference = rng.difference(other, sort=sort)
          if sort is None and len(other):
              # We dont sort (yet?) when empty GH#24959
              expected = expected.sort_values()
          tm.assert_index_equal(result_difference, expected)
  
file_path: pandas/pandas/tests/indexes/period/test_setops.py
imports: import numpy
  import pytest
  import pandas
  from pandas import PeriodIndex, date_range, period_range
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestPeriodIndex obj's underlying member method code with example usage: obj.test_difference(sort) without return types