求助！Mac下 from bs4 import BeautifulSoup4 报错！

'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work.'<>'You need to convert the code, either by installing it (`python setup.py install`) or by running 2to3 (`2to3 -w bs4`).'

报错如上，直接把小白干懵圈了。

还请大神指导！