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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