pytorch在Ananconda prompt安装opencv踩坑，一行代码解决PackagesNotFoundError

踩坑：
(base) C:\Users\admin>D:

(base) D:>cd D:\Anaconda3\envs\pytorch

(base) D:\Anaconda3\envs\pytorch>activate pytorch

(pytorch) D:\Anaconda3\envs\pytorch>conda install opencv_python-4.2.0-cp38-cp38-win_amd64.whl

出现问题：
Collecting package metadata (current_repodata.json): done

Solving environment: failed with initial frozen solve. Retrying with flexible solve.

Collecting package metadata (repodata.json): done

Solving environment: failed with initial frozen solve. Retrying with flexible solve.

PackagesNotFoundError: The following packages are not available from current channels:

• opencv_python-4.2.0-cp38-cp38-win_amd64.whl

Current channels:

• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro/win-64
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro/noarch
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/win-64
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/noarch
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/win-64
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/noarch
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/win-64
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/noarch
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/win-64
• https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
• https://repo.anaconda.com/pkgs/main/win-64
• https://repo.anaconda.com/pkgs/main/noarch
• https://repo.anaconda.com/pkgs/r/win-64
• https://repo.anaconda.com/pkgs/r/noarch
• https://repo.anaconda.com/pkgs/msys2/win-64
• https://repo.anaconda.com/pkgs/msys2/noarch

To search for alternate channels that may provide the conda package you’re
looking for, navigate to

https://anaconda.org

and use the search bar at the top of the page.

解决方法：
(base) C:\Users\admin>D:

(base) D:>cd D:\Anaconda3\envs\pytorch

(base) D:\Anaconda3\envs\pytorch>activate pytorch

(pytorch) D:\Anaconda3\envs\pytorch>pip install opencv-python