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今天看tornado异步时发现的错误，查了一下，原来tornado6以后就弃用了tornado.web.asynchronous这种写法了。

tornado降级回到5.1.1就没问题了。

官文文档：

Changed in version 3.1: The ability to use @gen.coroutine without @asynchronous.

Changed in version 4.3: Returning anything but None or a yieldable object from a method decorated with @asynchronous is an error. Such return values were previously ignored silently.

Deprecated since version 5.1: This decorator is deprecated and will be removed in Tornado 6.0. Use coroutines instead.

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