自己的mac上有python2.7和python3.6，平時(shí)都習(xí)慣于用python3.6，實(shí)驗(yàn)需要用到opencv，本來(lái)以為直接pip3 install 就可以了，結(jié)果發(fā)現(xiàn)這樣安裝的opencv還是python2的版本，python3不能使用，因此又重新找了方法。

step 1

使用終端安裝opencv
brew install opencv3 --with-contrib --with-python3 --without-python
注：python2和python3一次只能裝一個(gè)，用without-python可以跳過(guò)python2讓opencv裝在python3里。
$ brew link --force opencv3

step 2

找到python3類庫(kù)目錄site-packages

$ python
Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:07:29) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> print(numpy.__file__)
/Users/zhaofangyu/anaconda3/lib/python3.6/site-packages/numpy/__init__.py

注：numpy是任意import的一個(gè)在site-packages里的東西，也可以用其他的代替。

step 3

將cv2鏈接到python3類庫(kù)目錄下
$ cd /Users/zhaofangyu/anaconda3/lib/python3.6/site-packages/
$ ln -s /usr/local/Cellar/opencv/3.4.0/lib/python3.6/site-packages/cv2.cpython-36m-darwin.so

step 4

測(cè)試

$ python
Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:07:29) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>>