pyobject

I would just like to check if a PyObject that I have is None . I naively expected that any None Pyobject * returned from a function would be a NULL pointer, but that doesn't seem to be the case. So: how do I check if a PyObject * of mine points to a None object? I know that there are macros like PyInt_Check(PyObject *) around, but I couldn't find anything like PyNone_Check . I thought I could just check the equality between my PyObject and Py_None , but turns out I don't even know how to make equality comparisons with this library. You can just compare directly with Py_None using == : if (obj

I understand that everything in python is an Object and that the 'type' (or class) of these object is 'type'. Plus the type of type is also type itself. (as explained nicely here ) What I do not understand is how is this circular reference implemented? So i looked here . To quote the portion which might explain what I am looking for: PyTypeObject* PyObject.ob_type This is the type’s type, in other words its metatype. It is initialized by the argument to the PyObject_HEAD_INIT macro, and its value should normally be &PyType_Type. However, for dynamically loadable extension modules that must be

I've got a C python extension, and I would like to print out some diagnostics. I'm receiving a string as a PyObject*. What's the canonical way to obtain a string rep of this object, such that it usable as a const char *? update: clarified to emphasize access as const char *. Use PyObject_Repr (to mimic Python's repr function) or PyObject_Str (to mimic str ), and then call PyString_AsString to get char * (you can, and usually should, use it as const char* , for example: PyObject* objectsRepresentation = PyObject_Repr(yourObject); const char* s = PyString_AsString(objectsRepresentation); This