ioloop_test.py 文件源码

def test_multiple_add(self):
        sock, port = bind_unused_port()
        try:
            self.io_loop.add_handler(sock.fileno(), lambda fd, events: None,
                                     IOLoop.READ)
            # Attempting to add the same handler twice fails
            # (with a platform-dependent exception)
            self.assertRaises(Exception, self.io_loop.add_handler,
                              sock.fileno(), lambda fd, events: None,
                              IOLoop.READ)
        finally:
            self.io_loop.remove_handler(sock.fileno())
            sock.close()