code: def test_period_sub_offset(self):
      # freq is DateOffset
      msg = "|".join(
          [
              "Input has different freq",
              "Input cannot be converted to Period",
          ]
      )
  
      for freq in ["Y", "2Y", "3Y"]:
          per = Period("2011", freq=freq)
          assert per - offsets.YearEnd(2) == Period("2009", freq=freq)
  
          for off in [
              offsets.YearBegin(2),
              offsets.MonthBegin(1),
              offsets.Minute(),
              np.timedelta64(365, "D"),
              timedelta(365),
          ]:
              with pytest.raises(IncompatibleFrequency, match=msg):
                  per - off
  
      for freq in ["M", "2M", "3M"]:
          per = Period("2011-03", freq=freq)
          assert per - offsets.MonthEnd(2) == Period(
              "2011-01", freq=freq
          )
          assert per - offsets.MonthEnd(12) == Period(
              "2010-03", freq=freq
          )
  
          for off in [
              offsets.YearBegin(2),
              offsets.MonthBegin(1),
              offsets.Minute(),
              np.timedelta64(365, "D"),
              timedelta(365),
          ]:
              with pytest.raises(IncompatibleFrequency, match=msg):
                  per - off
  
      # freq is Tick
      for freq in ["D", "2D", "3D"]:
          per = Period("2011-04-01", freq=freq)
          assert per - offsets.Day(5) == Period("2011-03-27", freq=freq)
          assert per - offsets.Hour(24) == Period(
              "2011-03-31", freq=freq
          )
          assert per - np.timedelta64(2, "D") == Period(
              "2011-03-30", freq=freq
          )
          assert per - np.timedelta64(3600 * 24, "s") == Period(
              "2011-03-31", freq=freq
          )
          assert per - timedelta(-2) == Period("2011-04-03", freq=freq)
          assert per - timedelta(hours=48) == Period(
              "2011-03-30", freq=freq
          )
  
          for off in [
              offsets.YearBegin(2),
              offsets.MonthBegin(1),
              offsets.Minute(),
              np.timedelta64(4, "h"),
              timedelta(hours=23),
          ]:
              with pytest.raises(IncompatibleFrequency, match=msg):
                  per - off
  
      for freq in ["h", "2h", "3h"]:
          per = Period("2011-04-01 09:00", freq=freq)
          assert per - offsets.Day(2) == Period(
              "2011-03-30 09:00", freq=freq
          )
          assert per - offsets.Hour(3) == Period(
              "2011-04-01 06:00", freq=freq
          )
          assert per - np.timedelta64(3, "h") == Period(
              "2011-04-01 06:00", freq=freq
          )
          assert per - np.timedelta64(3600, "s") == Period(
              "2011-04-01 08:00", freq=freq
          )
          assert per - timedelta(minutes=120) == Period(
              "2011-04-01 07:00", freq=freq
          )
          assert per - timedelta(days=4, minutes=180) == Period(
              "2011-03-28 06:00", freq=freq
          )
  
          for off in [
              offsets.YearBegin(2),
              offsets.MonthBegin(1),
              offsets.Minute(),
              np.timedelta64(3200, "s"),
              timedelta(hours=23, minutes=30),
          ]:
              with pytest.raises(IncompatibleFrequency, match=msg):
                  per - off
  
imports: from datetime import timedelta
  import numpy
  import pytest
  from pandas._libs.tslibs.period import IncompatibleFrequency
  from pandas import NaT, Period, Timedelta, Timestamp, offsets
label_desc: Use image node_id 9 for calling the TestPeriodArithmetic obj's underlying member method code with example usage: obj.test_period_sub_offset() without return types