code: def test_getitem(self):
      idx1 = period_range(
          "2011-01-01", "2011-01-31", freq="D", name="idx"
      )
  
      for idx in [idx1]:
          result = idx[0]
          assert result == Period("2011-01-01", freq="D")
  
          result = idx[-1]
          assert result == Period("2011-01-31", freq="D")
  
          result = idx[0:5]
          expected = period_range(
              "2011-01-01", "2011-01-05", freq="D", name="idx"
          )
          tm.assert_index_equal(result, expected)
          assert result.freq == expected.freq
          assert result.freq == "D"
  
          result = idx[0:10:2]
          expected = PeriodIndex(
              [
                  "2011-01-01",
                  "2011-01-03",
                  "2011-01-05",
                  "2011-01-07",
                  "2011-01-09",
              ],
              freq="D",
              name="idx",
          )
          tm.assert_index_equal(result, expected)
          assert result.freq == expected.freq
          assert result.freq == "D"
  
          result = idx[-20:-5:3]
          expected = PeriodIndex(
              [
                  "2011-01-12",
                  "2011-01-15",
                  "2011-01-18",
                  "2011-01-21",
                  "2011-01-24",
              ],
              freq="D",
              name="idx",
          )
          tm.assert_index_equal(result, expected)
          assert result.freq == expected.freq
          assert result.freq == "D"
  
          result = idx[4::-1]
          expected = PeriodIndex(
              [
                  "2011-01-05",
                  "2011-01-04",
                  "2011-01-03",
                  "2011-01-02",
                  "2011-01-01",
              ],
              freq="D",
              name="idx",
          )
          tm.assert_index_equal(result, expected)
          assert result.freq == expected.freq
          assert result.freq == "D"
  
imports: from datetime import datetime
  import re
  import numpy
  import pytest
  from pandas._libs.tslibs import period
  from pandas.errors import InvalidIndexError
  import pandas
  from pandas import DatetimeIndex, NaT, Period, PeriodIndex, Series, Timedelta, date_range, notna, period_range
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestGetItem obj's underlying member method code with example usage: obj.test_getitem() without return types