Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/4269#issuecomment-108165966 @potix2, yep, that's the right set of versions to test against. In the top-level test runner script, I think that we can check whether those versions are installed (using `which`) then build up a list of Python executables that we'll run against. So maybe by default we'll run against whatever subset of those are installed, but will have an option to manually specify just one version to run for manual testing / debugging. By the way, if it's easier then I'd be fine with rewriting this file in Python rather than keeping it as bash.
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