setuptools on OSX

起因是想要装 tox，然而 pip install tox 并不能顺利跑通，报错如下： Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/2w/d1r9vfrs7rjbdjdcfyzmq_2rbjm717/T/pip-build-6nwmYd/pluggy/ 因为之前在官网上看到

>>阅读原文<<