安裝過程踩了一堆坑，才發現brew安裝完畢後下面會有接下來提示，按照提示，複製命令執行即可安裝完成

1、

brew tap homebrew/science

2、

brew install opencv

3、

安裝完畢看底部提示

Python modules have been installed and Homebrew's site-packages is not

in your Python sys.path, so you will not be able to import the modules

this formula installed. If you plan to develop with these modules,

please run:

  mkdir -p ~/Library/Python/2.7/lib/python/site-packages

  echo 'import site; site.addsitedir("/usr/local/lib/python2.7/site-packages")' >> ～/Library/Python/2.7/lib/python/site-packages/homebrew.pth

1、

mkdir -p ~/Library/Python/2.7/lib/python/site-packages

2、

echo 'import site; site.addsitedir("/usr/local/lib/python2.7/site-packages")' >> ～/Library/Python/2.7/lib/python/site-packages/homebrew.pth