code: def test_constructor_identity(self):
      s = WeakSet(self.items)
      t = WeakSet(s)
      self.assertNotEqual(id(s), id(t))
  
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 21 for calling the TestWeakSet obj's underlying member method code with example usage: obj.test_constructor_identity() without return types