Python编写的桌面图形程序，如何实现版本更新和下载？

def work(self):  # 新建一个文件对象  temp_file = os.path.join(self.download_path,'update.zip') # 指定更新包下载的路径  logger.info("下载临时文件路径为：{}".format(temp_file))  with open(temp_file,'wb') as self.fileobj:    # 请求更新文件包    f = requests.get(self.download_url, stream=True)    # 写入文件    offset = 0    for chunk in f.iter_content(chunk_size=self.buffer):      if not chunk:        break      self.fileobj.seek(offset)      self.fileobj.write(chunk)      offset = offset + len(chunk)      proess = offset / int(self.filesize) * 100      # logger.info("写入块：{},{}".format(offset,proess))      self.download_proess_signal.emit(int(proess))

def work(self):    # 1.杀死主程序进程    for proc in psutil.process_iter():        if proc.name() == 'xxx.exe':            proc.kill()    # 2.获取程序本地路径    current_path = os.path.dirname(os.path.abspath(__file__))    logger.info("当前程序路径：{}".format(current_path))    # 3.解压新版本压缩包到程序本地路径    update_file_path = os.path.join(self.download_temp_path, 'update.zip')    shutil.unpack_archive(        filename=update_file_path,        extract_dir=current_path    )    # 4.删除临时文件夹和文件    os.remove(update_file_path)    shutil.rmtree(self.download_temp_path)