Mac系统上, 无法下载, 提示: ValueError: Sign not allowed in string format specifier

[liufzhq]

在Mac系统, 用pip3 安装you-get后, 运行you-get -i URL 可以查看视频的信息, 但一旦执行下载就会失败, 运行debug后提示如下:
Traceback (most recent call last):
File "/usr/local/bin/you-get", line 8, in
sys.exit(main())
File "/usr/local/lib/python3.7/dist-packages/you_get/main.py", line 92, in main
main(**kwargs)
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 1798, in main
script_main(any_download, any_download_playlist, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 1686, in script_main
**extra
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 1327, in download_main
download(url, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 1789, in any_download
m.download(url, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/you_get/extractor.py", line 61, in download_by_url
self.download(**kwargs)
File "/usr/local/lib/python3.7/dist-packages/you_get/extractor.py", line 241, in download
av=stream_id in self.dash_streams)
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 997, in download_urls
bar.update()
File "/usr/local/lib/python3.7/dist-packages/you_get/common.py", line 827, in update
self.current_piece, self.total_pieces, self.speed
ValueError: Sign not allowed in string format specifier

换了一台电脑, 还是如此. 不知道有没有高手指点一下, 看看是什么问题?