Hello Amy,

On Wed, Feb 13, 2019 at 10:38 AM Amy <ekim94525@gmail.com> wrote:

"pypy3 -m pip install opencv-python". However, it give an error: "Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python

This happens because opencv decided to release only binary wheels on PyPI, as you can see here; note that the only files available are *.whl:

https://pypi.org/project/opencv-python/#files

The great advantage of binary wheels is that you don't have to recompile the package yourself; however, they are tied to a particular combination of OS/python version: opencv didn't release any binary wheel for PyPy, so pip cannot find any.

When pip cannot locate a wheel, it tries to download a source package (like .tar.bz2 or .zip) and compile it on the fly; however, opencv didn't release any, that's why you get the error.

Your best bet to have opencv on PyPy is to clone the source repo from github and run setup.py yourself:

$ git clone https://github.com/skvark/opencv-python

$ cd opencv-python

$ pypy3 setup.py install

ciao,

Anto