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http://llvm.org/docs/GettingStarted.html currently mentions Python 2.5 as a minimum required version. I'd like to use argparse <https://docs.python.org/dev/library/argparse.html> in a script and be able to test this script. This requires Python 2.7. This version has been around since 2010, and afaiu, is available on all modern platforms. Is there any reason not to change minimum required