I wrote:
[snip]
> What am I missing?
The fundamental problem is that this:
if (!(ro = PyObject_New(MyIter, &MyIterType))) return NULL;
is really only a malloc() - it doesn't call the tp_new function at all. This is not really clear in the 2.3 version of the C API document that I was consulting - the 2.4 version is much clearer.
I have no idea how to do in C all the things that calling a class constructor in Python does. Am I supposed to be calling tp_new & tp_init directly?
In the end, this particular class really only needs to be created from a factory function, so I removed the tp_new member altogether and just wrote a C function to initialise the object, and called that from the C factory function.
[The above is not particular to the fact that my class is an iterator - all C classes have the same behaviour. My test of a plain-old class probably looked like it worked due to lucky memory patterns.]
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