解决OpenCV中Python3 import cv2的错误

首先更换源，见https://www.cnblogs.com/cc-xiao5/p/11233256.html，记得更新库

然后依次进行以下操作

一、安装Python-dev

sudo apt-get install aptitude 
sudo aptitude install python-dev 

二、安装pip3

sudo apt-get install python3-pip
sudo pip3 install --upgrade pip

三、安装CV2

先sudo apt-get update更新然后在安装即可

sudo pip3 install opencv-python

最后顺带安装numpy, scipy, matplotlib 记得更改权限

pip3 install numpy
pip3 install scipy
pip3 install matplotlib
pip3 install pandas

 如果系统有python2和python3，将python3设置为默认

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150