It needs to be for python 2.7
I've tried sudo pip install opencv-python but it doesn't work.
Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python
Re: How do I install OpenCV 3?
Try apt-get.
Re: How do I install OpenCV 3?
apt-get only installs opencv 2 

- Davespice
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Re: How do I install OpenCV 3?
Always check the FAQ, this is the last question at the bottom of the page;
https://astro-pi.org/missions/space-lab/faq/
https://astro-pi.org/missions/space-lab/faq/