Python-сообщество

    def get(self):
        self.foo0()
    def foo0(self):
        self.write("0")
        self.bar(callback=self.foo1)
    def foo1(self):
        self.write("1")
        self.bar(callback=self.foo2)
    def foo2(self):
        self.write("2")
        self.finish()

    def bar(self, callback):
        self.write("-bar-")
        callback()

    def get(self):
        self.start(self.foo0)
    def foo0(self):
        self.write("0")
        yield self.bar
        self.write("1")
        yield self.bar
        self.write("2")
        self.finish()

    def bar(self, callback):
        self.write("-bar-")
        callback()

    def start(self, func):
        it = func()
        cb = it.next()
        cb(callback=self.async_callback(self.start2,it))
        
    def start2(self, it):
        try:
            cb = it.next()
            cb(callback=self.async_callback(self.start2,it))
        except StopIteration:
            pass

try:
    result = yield foo()
exept MyExc:
    pass

    @tornado.web.asynchronous
    @tornadoinline.inline_mongo
    def get(self):
        print 'start foo0'
        self.write("start<br/>\n")
        
        yield self.db.user.save({ 'login':'bill', 'level':0 })
        self.write('save ok<br/>\n')
        
        self.write("find")
        try:
            user = yield self.db.user.find_one({})
            self.write(str(user) + '<br/>\n')
        except tornadoinline.MongoError:
            self.write('-error-')
        
        self.write("finish")
        self.finish()