code: def test_isoparse_sep_none(datestr, sep):
      isostr = datestr + sep + "14:33:09"
      assert isoparse(isostr) == datetime(2014, 1, 1, 14, 33, 9)
  
imports: from __future__ import unicode_literals
  from datetime import datetime, timedelta, date, time
  import itertools
  from dateutil import tz
  from dateutil.tz import UTC
  from dateutil.parser import isoparser, isoparse
  import pytest
  import six
label_desc: Use image node_id 13 for calling a global function with example usage: test_isoparse_sep_none(datestr, sep) without return types