Improve error message when python fails in develop #1644
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Inspired by https://www.youtube.com/live/zepPZ6MFiGs?feature=share&t=648, i wanted to improve the error message when
maturin develop
fails becausepython
doesn't work.I unfortunately failed to reproduce the error in the video, but i'm nonetheless confident that this is the correct change: It shouldn't say "The given list of python interpreters is invalid" when you didn't provide any list. iirc the error message comes from a time when i assumed users would provide a list like python3.5 python3.6 python3.7 instead of building for one version per CI job.
I thought about redoing the error system around interpreters but i think just pointing out the faulty interpreter is all a user needs to understand and debug the problem