code: def test_pindex_multiples(self):
      expected = PeriodIndex(
          [
              "2011-01",
              "2011-03",
              "2011-05",
              "2011-07",
              "2011-09",
              "2011-11",
          ],
          freq="2M",
      )
  
      pi = period_range(start="1/1/11", end="12/31/11", freq="2M")
      tm.assert_index_equal(pi, expected)
      assert pi.freq == offsets.MonthEnd(2)
      assert pi.freqstr == "2M"
  
      pi = period_range(start="1/1/11", periods=6, freq="2M")
      tm.assert_index_equal(pi, expected)
      assert pi.freq == offsets.MonthEnd(2)
      assert pi.freqstr == "2M"
  
file_path: pandas/pandas/tests/indexes/period/test_period.py
imports: import numpy
  import pytest
  from pandas import Index, NaT, Period, PeriodIndex, Series, date_range, offsets, period_range
  import pandas._testing
label_desc: Use image node_id 7 for calling the TestPeriodIndex obj's underlying member method code with example usage: obj.test_pindex_multiples() without return types