关于Anaconda中opencv-python的安装
首先，尝试用pip进行安装
(base) D:\Anaconda3\Lib>pip install opencv-python -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple/
Collecting opencv-python
Downloading http://pypi.doubanio.com/packages/01/9b/be08992293fb21faf35ab98e06924d7407fcfca89d89c5de65442631556a/opencv-python-4.5.3.56.tar.gz (89.2MB)
100% |████████████████████████████████| 89.2MB 3.1MB/s
Could not find a version that satisfies the requirement numpy==1.13.3 (from versions: )
No matching distribution found for numpy==1.13.3
You are using pip version 10.0.1, however version 21.2.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
就算用豆瓣源，也还总是报错，报错原因大概是numpy版本不符合？？？
接着我将（base）环境中的numpy重装了，仍然没有解决
此时，打开官网/清华镜像，去寻找opencv-python的python38版本
显然，选择最下面一个进行下载
下载结束后将文件放在 .\Anaconda3\Scripts 里边
然后打开cmd，输入activate进入（base）环境，用pip进行安装
pip install "D:\Anaconda3\Scripts\opencv_python-4.5.3-cp38-cp38-win_amd64.whl"
此时 报错
Requirement 'D:\\Anaconda3\\Scripts\\opencv_python-4.5.3-cp38-cp38-win_amd64.whl' looks like a filename, but the file does not exist
opencv_python-4.5.3-cp38-cp38-win_amd64.whl is not a supported wheel on this platform.
参考
https://www.cnblogs.com/ruoli-s/p/14204897.html
打开python后 输入
>>> import pip._internal
>>> print(pip._internal.pep425tags.get_supported())
[('cp38', 'cp38m', 'win_amd64'), ('cp38', 'none', 'win_amd64'), ('py3', 'none', 'win_amd64'), ('cp38', 'none', 'any'), ('cp3', 'none', 'any'), ('py38', 'none', 'any'), ('py3', 'none', 'any'), ('py37', 'none', 'any'), ('py36', 'none', 'any'), ('py35', 'none', 'any'), ('py34', 'none', 'any'), ('py33', 'none', 'any'), ('py32', 'none', 'any'), ('py31', 'none', 'any'), ('py30', 'none', 'any')]
可以看到，我们的文件名"cp38-cp38-win_amd64"并不能识别，故改为"cp38-cp38m-win_amd64"
再次执行
pip install "D:\Anaconda3\Scripts\opencv_python-4.5.3-cp38-cp38m-win_amd64.whl"
终于看到了
Installing collected packages: opencv-python
Successfully installed opencv-python-4.5.3