记录一个错误：cannot schedule the futures after interprete shutdown

今天运行代码时出现一个错误。在python3.8及以下版本的环境中没有问题，在python3.9中出错，报：runtimeerror:cannot schedule the futures after interprete shutdown。由于对通讯一块不熟，查了好久，才发现是版本的问题，python3.9中协程的实现不用这种。

原代码：

class GetCurrentCheckBoxRequest(BaseRequest):
    """获取当前的检测框"""
    @gen.coroutine
    def get(self):
        print("GetCurrentCheckBoxRequest")
        func = RequestHHandler.get_current_check_box_handler
        response = yield self.async_handler(func)
        self.write(response)


class SetCurrentCheckBoxRequest(BaseRequest):
    """获取当前的检测框"""
    @gen.coroutine
    def post(self):
        print("SetCurrentCheckBoxRequest")
        func = RequestHHandler.set_current_check_box_handler
        args = json.loads(self.request.body)
        response = yield self.async_handler(func, args)
        self.write(response)
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修改：

class GetCurrentCheckBoxRequest(BaseRequest):
    """获取当前的检测框"""
    def get(self):
        print("GetCurrentCheckBoxRequest")
        
        response =RequestHHandler.get_current_check_box_handler
        self.write(response)


class SetCurrentCheckBoxRequest(BaseRequest):
    """获取当前的检测框"""
    #@gen.coroutine
    def post(self):
        print("SetCurrentCheckBoxRequest")
        #func = RequestHHandler.set_current_check_box_handler
        #args = json.loads(self.request.body)
        #response = yield self.async_handler(func, args)
        args = json.loads(self.request.body)
        response = RequestHHandler.set_current_check_box_handler
        self.write(response)
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