opencv-python 国内源

D:\coding>pip install opencv-python==4.2.0.32 -i https://pypi.tuna.tsinghua.edu.cn/simple
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won’t be maintained after that date. A future version of pip will drop support for Pytho
n 2.7.
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting opencv-python
Downloading https://pypi.tuna.tsinghua.edu.cn/packages/a1/d6/8422797e35f8814b1d9842530566a949d9b5850a466321a6c1d5a99055ee/opencv-python-4.3.0.38.tar.gz (88.0MB)
|████▌ | 12.6MB 504kB/s eta 0:02:30

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opencv-python的最新版本已经不开放对python2.7的支持，所以想要python2.7想要正确安装opencv-python只能下载低版本。

解决办法：python -m pip install opencv-python==4.2.0.32

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由于一些经典的算法被申请了版权，新版本有很大的限制，所以建议选用3.4.2.17以下的版本

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