How do I install opencv in SageMath 8.8 on Windows 10

edit

I did try " pip install opencv_python" and get the same error.

(sage-sh) ssally@SSALLY:~$ pip install opencv_python 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 Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support (https://pip.pypa.io/en/latest/develop...) Collecting opencv_python ERROR: Could not find a version that satisfies the requirement opencv_python (from versions: none) ERROR: No matching distribution found for opencv_python

(sage-sh) ssally@SSALLY:~$ pip install opencv-python ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: none)

It appears that OpenCV only supplies pre-built binary wheels on PyPI, and unsurprisingly does not supply one built for Cygwin. This is a problem to ask of the OpenCV developers--at the very least the should also publish the source tarball on PyPI so it can be downloaded and (with any luck) built on platforms that they don't ship wheels for. Alternatively you can see if you can download the source tarball yourself, and use pip to install it manually like pip install <path/to/tarball>.