alt Hacker News> With the benefit of hindsight, though, Python 3 could have been done as a non-breaking upgrade.
Not without enormous and unnecessary pain.
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JoshTriplett • yesterday at 8:20 PM
It would absolutely have been harder. But the pain of going that path might potentially have been less than the pain of the Python 2 to Python 3 transition. Or, possibly, it wouldn't have been; I'm not claiming the tradeoff is obvious even in hindsight here.
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Pain on whose part? There was certainly pain porting all the code that had to be ported to Python 3 so that the Python developers could have an easier time.