一个简单的tornado+coroutine+yield的例子
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class MainHandler(tornado.web.RequestHandler):
cond = None
@tornado.gen.coroutine
def test(self):
print('a')
a = 1
self.cond = tornado.locks.Condition()
yield self.cond.wait(timeout=datetime.timedelta(seconds=10))
a = 2
print('b')
return a, 2
@tornado.gen.coroutine
def get(self):
a, b = yield self.test()
print(a, b)
self.render("index.html")
这几个需要配合使用，使用得不好就可能会出现下面的错误：
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AssertionError: yield from wasn't used with future
tornado.gen.BadYieldError: yielded unknown object
ValueError: not enough values to unpack (expected 2, got 0)
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