code: def test_inplace_on_self(self):
      t = self.s.copy()
      t |= t
      self.assertEqual(t, self.s)
      t &= t
      self.assertEqual(t, self.s)
      t -= t
      self.assertEqual(t, WeakSet())
      t = self.s.copy()
      t ^= t
      self.assertEqual(t, 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 38 for calling the TestWeakSet obj's underlying member method code with example usage: obj.test_inplace_on_self() without return types