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The world needed a Python 3 as much as it needed a Perl 6. Basically breaking backward compatibility as a matter of principle rather than any logical technical reasons. Oh, but backward compatibility isn't ALWAYS broken, you'll just have to run it in both versions and see which crashes less. And wither now the world of still perfectly good but unmaintained Python 2 code? I especially love trying to run that stuff when it was written under the assumption that it could always be run by /usr/bin/python. What a waste.