- How is
__slots__implemented in Python? - Is this exposed in the C interface?
- How do I get
__slots__behaviour when defining a Python class in C viaPyTypeObject?
How is __slots__ implemented in Python?
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When creating Python classes, they by default have a
__dict__and you can set any attribute on them. The point of slots is to not create a__dict__to save space.In the C interface it's the other way around, an extension class has by default no
__dict__, and you would instead explicitly have to add one and add getattr/setattr support to handle it (although luckily there are methods for this already,PyObject_GenericGetAttrandPyObject_GenericSetAttr, so you don't have to implement them, just use them. (Funnily there is not PyObject_GenericDelAttr, though, I'm not sure what that is about. (I should probably stop nesting parenthesis like this (or not)))).Slots therefore aren't needed nor make sense for Extension types. By default you just let your getattr/setatttr methods access only those attributes that the class has.
As for how it's implemented, the code is in typeobject.c, and it's pretty much just a question of "If the object has a
__slots__attribute, don't create a__dict__. Quite unexciting. :-)