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It always strikes me, that the things that parts of python that create problems for people trying to optimize it, are all things of relatively small importance. Like __new__, __del__ semantics and changing the stack by inspection. I wish Python3 had just let go of the slow scripting-only parts.

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The problem is that often while regular users are not directly using those features, they are using libraries that do use them. As a concrete example, people writing webapps with Django probably (often) aren't using some of the crazier class metaprogramming, but they are using Django's models, which use lots of it.

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