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The people who really decide what you do don't care about syntax. They'll ask you if it is faster. And Python 3 is even slower than Python 2.

You don't have this problem with PHP. "Hey, Boss! We need to rewrite our code for PHP 7." – "Will it be faster? How much?" – "It will be faster. By factor X." – "Go on, make it so."

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The people who really decide what you do don't care about syntax.

Some bosses care about syntax, at least if you phrase it as maintainability.

That's a good point despite the downvotes. If you don't need any of the Python 3 goodies, by upgrading you will make your code run even slower. Hard to justify.

If you care this much about performance, python is most likely wrong language for you, you should try statically typed languages instead.

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