ValueError: zlib required for Pillow on OS X
$ brew tap homebrew/dupes
$ brew install zlib
$ brew link --force zlib Then install Pillow:
$ pip install Pillow 参考链接：
http://pillow.readthedocs.org/en/3.1.x/installation.html
http://stackoverflow.com/questions/19532125/cant-install-pil-after-mac-os-x-10-9
http://stackoverflow.com/questions/18246211/no-zlib-support-with-pillow-w-python3-3