[Python-Dev] Semantics of int(), index() (original) (raw)

Mark Dickinson dickinsm at gmail.com
Tue Apr 2 09:07:45 CEST 2013

On Tue, Apr 2, 2013 at 1:44 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

int() and operator.index() are both type coercion calls to produce true Python integers - they will never return a subclass, and this is both deliberate and consistent with all the other builtin types that accept an instance of themselves as input to the constructor.

That's good to hear.

There's code in the slot wrappers so that if you return a non-int object from either int or index, then the interpreter will complain about it, and if you return a subclass, it will be stripped back to just the base class.

Can you point me to that code? All I could find was PyLong_Check calls (I was looking for PyLong_CheckExact).

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