完整報錯如下:

(Python3.6) appleyuchi@ubuntu19:5.2-使用Tornado進行長輪詢$ python shopping_cart.py?
[I 200409 20:55:43 web:2162] 200 GET / (::1) 1.99ms
[I 200409 20:55:43 web:2162] 200 GET /static/images/internet.jpg (::1) 3.80ms
[I 200409 20:55:43 web:2162] 200 GET /static/scripts/inventory.js?v=081e5ab58d037c4cc17adb713e0b601b (::1) 0.66ms
[E 200409 20:55:43 web:1670] Uncaught exception GET /cart/status?session=a59525ab-ef55-4f2d-989a-90baea6d6578 (::1)
? ? HTTPServerRequest(protocol='http', host='localhost:8000', method='GET', uri='/cart/status?session=a59525ab-ef55-4f2d-989a-90baea6d6578', version='HTTP/1.1', remote_ip='::1')
? ? Traceback (most recent call last):
? ? ? File "/home/appleyuchi/anaconda3/envs/Python3.6/lib/python3.6/site-packages/tornado/web.py", line 1548, in _stack_context_handle_exception
? ? ? ? raise_exc_info((type, value, traceback))
? ? ? File "<string>", line 4, in raise_exc_info
? ? ? File "/home/appleyuchi/anaconda3/envs/Python3.6/lib/python3.6/site-packages/tornado/web.py", line 1756, in wrapper
? ? ? ? result = method(self, *args, **kwargs)
? ? ? File "shopping_cart.py", line 64, in get
? ? ? ? self.application.shoppingCart.register(self.async_callback(self.on_message))
? ? AttributeError: 'StatusHandler' object has no attribute 'async_callback'

故障原因：

代碼一般出自Tornado2.x

解決方案:

self.application.shoppingCart.register(self.async_callback(self.on_message))

改成:

self.application.shoppingCart.register(callback=self.on_message)

?

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