code: def test_doctest_pytz_tzinfo():
      nfailures, ntests = doctest.testmod(pytz.tzinfo)
      assert not nfailures
  
imports: import doctest
  import pytz
  import pytz.tzinfo
label_desc: Use image node_id 2 for calling a global function with example usage: test_doctest_pytz_tzinfo() without return types