Python安装cv2库出错及解决：Could not find a version that satisfies the requirement cv2

　　原来的安装命令是：

Python安装OpenCV_柳鲲鹏-CSDN博客

　　今天怎么不灵了？初步判断是原来使用3.5，现在改用了2.7（项目需要）。

解决办法一（网友提供）

 pip3 install opencv-python

解决办法二

　　尝试运行命令：

pip install cv2
Collecting cv2Could not find a version that satisfies the requirement cv2 (from versions: )
No matching distribution found for cv2

　　看到这个错误，赶紧搜索，找到的办法都无法解决。于是怀疑查找的更新库有问题……可是为什么改了也不对？

　　后来同事过来一看，直接搜索cv2，原来安装办法是：

sudo apt-get install python-opencv# 同理，还有其他的：python-scipy/python-numpy/python-matplotlib/python-requests/python-skimage

　　然后进python, import cv2，成功。

　　查看版本号：

python -V
pip -V

filterpy可以直接用pip安装。

sudo pip2 install opencv-pythonsudo pip2 install --upgrade pipsudo pip  install --upgrade pip

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