Method showwarning

Lib/test/test_free_threading/test_races.py:299–300

(*args)

            warnings.filterwarnings('ignore', message='not matched', category=Warning, lineno=lineno)
        # Override showwarning() so that we don't actually show warnings.
        def showwarning(*args):
            pass
        warnings.showwarning = showwarning

    def tearDown(self):