ioloop_test.py 文件源码

def test_handle_callback_exception(self):
        # IOLoop.handle_callback_exception can be overridden to catch
        # exceptions in callbacks.
        def handle_callback_exception(callback):
            self.assertIs(sys.exc_info()[0], ZeroDivisionError)
            self.stop()
        self.io_loop.handle_callback_exception = handle_callback_exception
        with NullContext():
            # remove the test StackContext that would see this uncaught
            # exception as a test failure.
            self.io_loop.add_callback(lambda: 1 / 0)
        self.wait()