ERROR: opencv_python-4.4.0-cp38-cp38-win_amd64.whl is not a supported wheel on this platform.
WARNING: You are using pip version 20.2.3; however, version 20.3.1 is available.
You should consider upgrading via the ‘e:\python\python39\python.exe -m pip install –upgrade pip’ command.
安装opencv库提示如上错误，一是下载与本地python版本一致的库文件。
下载地址：http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv
再就是电脑里的pip没有与之完全对应，出现不支持的现象。
解决方案
使用更新指令更新pip：
python -m pip install --upgrade pip
就可以解决问题了。
提示：更新指令连接可能不是很稳定，会更新一半报错，多试几次就好了~
E:\python>python39\python.exe -m pip install –upgrade pip
Collecting pip
Using cached pip-20.3.1-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.2.3
Uninstalling pip-20.2.3:
Successfully uninstalled pip-20.2.3
Successfully installed pip-20.3.1
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