Method sub

Lib/test/test_context.py:362–367

(num)

        cvar = contextvars.ContextVar('cvar')

        def sub(num):
            for i in range(10):
                cvar.set(num + i)
                time.sleep(random.uniform(0.001, 0.05))
                self.assertEqual(cvar.get(), num + i)
            return num

        tp = concurrent.futures.ThreadPoolExecutor(max_workers=10)
        try: