Tornado:将分块数据流式传输到文件时，如果data_received中出现异常/错误，如何关闭文件对象

class MyHandler(tornado.web.RequestHandler):
    def initialize(self):
        self.file = None

class MyHandler(tornado.web.RequestHandler):
    def data_received(self, chunk):
        try:
            if self.file is None:
                self.file = open("path/to/file", "wb")
            self.file.write(chunk)
        except Exception as e:
            # 处理异常
            self.close_file()
            # 其他异常处理逻辑

    def close_file(self):
        if self.file is not None:
            self.file.close()
            self.file = None