code: def test_iso_conversion(self):
      # GH #21877
      expected = Timedelta(1, unit="s")
      assert to_timedelta("P0DT0H0M1S") == expected
  
imports: from datetime import timedelta
  import sys
  from hypothesis import given, strategies
  import numpy
  import pytest
  from pandas._libs import lib
  from pandas._libs.tslibs import NaT, iNaT
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  from pandas.errors import OutOfBoundsTimedelta
  from pandas import Timedelta, to_timedelta
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestTimedeltas obj's underlying member method code with example usage: obj.test_iso_conversion() without return types