code: def test_discard(self):
      a, q = ustr("a"), ustr("Q")
      self.s.discard(a)
      self.assertNotIn(a, self.s)
      self.s.discard(q)
      self.assertRaises(TypeError, self.s.discard, [])
  
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 27 for calling the TestWeakSet obj's underlying member method code with example usage: obj.test_discard() without return types