code: def send_notification(title="Douban.fm", content="", cover_file=None):
      '''发送桌面通知'''
      if PLATFORM == 'Linux':
          send_Linux_notify(title, content, cover_file)
      elif PLATFORM == 'Darwin':
          send_OS_X_notify(title, content, cover_filef send_notification(title="Douban.fm", content="", cover_file=None):
      '''发送桌面通知'''
      if PLATFORM == 'Linux':
          send_Linux_notify(title, content, cover_file)
      elif PLATFORM == 'Darwin':
          send_OS_X_notify(title, content, cover_file)
docs: 发送桌面通知