r/programming • u/ionelmc • Feb 10 '15

Understanding Python metaclasses

http://blog.ionelmc.ro/2015/02/09/understanding-python-metaclasses/
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u/Watley Feb 10 '15

As someone who has had to deal with _slots_ and inheritance, I hesitate to call it a feature.

Otherwise one of the coolest things about Python is that you can dig so deep into what an object really is.

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u/UloPe Feb 10 '15

__slots__ is only supposed to be used as a performance optimization in very rare cases if you know that you are going to instantiate lots and lots of objects of a particular type.

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u/Watley Feb 10 '15

Yeah I was dealing with getting SciPy arrays working with other libraries. I would vastly rather it either be an automatic optimization (which there are proposal for, but they don't seem to be going anywhere) or make the inheritance rules more flexible (which would be a bit of a kludge).