code: def test_lt(self):
      self.assertTrue(self.ab_weakset < self.abcde_weakset)
      self.assertFalse(self.abcde_weakset < self.def_weakset)
      self.assertFalse(self.ab_weakset < self.ab_weakset)
      self.assertFalse(WeakSet() < WeakSet())
  
imports: import unittest
  from weakref import WeakSet
  import copy
  import string
  from collections import UserString
  from collections.abc import Set, MutableSet
  import gc
  import contextlib
  from test import support
label_desc: Use image node_id 16 for calling the TestWeakSet obj's underlying member method code with example usage: obj.test_lt() without return types