sudo pip install opencv-python
完成后若出现如下问题：
>>> import cv2
RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/cv2/__init__.py", line 3, in <module>
from .cv2 import *
ImportError: numpy.core.multiarray failed to import
这是因为系统调用了自带的numpy，把系统自带的numpy删掉
sudo rm -rf /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy
再重新安装numpy
sudo pip install numpy
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