Implementing PyMyType_Check methods with Python C API?

Question

All the Python-provided types have a check method (i.e., PyList_Check) that allows you to check if an arbitrary PyObject* is actually a specific type.

How can I implement this for my own types? I haven't found anything good online for this, though it seems like a pretty normal thing to want to do.

Also, maybe I'm just terrible at looking through large source trees, but I cannot for the life of me find the implementation of PyList_Check or any of it's companions in the Python (2.5) source.

docs.python.org/c-api/structures.html#PyMemberDef (yes, I know that is 2.6.5 docs, but I'd bee surprised if essential structures changed). — msw
– msw, Commented May 10, 2010 at 19:51

ohmu · Accepted Answer · 2015-06-04 16:14:52Z

2

That's because they're macros that use deep magic. Save yourself a bit of headache and use PyObject_IsInstance() instead.

edited Jun 4, 2015 at 16:14

ohmu

19.9k44 gold badges114 silver badges151 bronze badges

answered May 10, 2010 at 19:43

Ignacio Vazquez-Abrams

804k160 gold badges1.4k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Noob Saibot · Accepted Answer · 2014-11-11 22:03:06Z

0

If you'd like to implement your own macro, you could try...

#define PyMyType_Check(op) \
    PyObject_TypeCheck(op, &PyMyType_Type)

answered Nov 11, 2014 at 22:03

Noob Saibot

4,77910 gold badges40 silver badges61 bronze badges

Collectives™ on Stack Overflow

Implementing PyMyType_Check methods with Python C API?

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related