setuptools on OSX

起因是想要裝 tox，然而 pip install tox 並不能順利跑通，報錯如下： Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/2w/d1r9vfrs7rjbdjdcfyzmq_2rbjm717/T/pip-build-6nwmYd/pluggy/ 因爲之前在官網上看到

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