return tuple from C to python (extending python)

Kiran Kiran.Karra at
Wed Oct 25 00:24:54 CEST 2006

Hi all, I want to make python call some C functions, process them and
return them.

Ok, I got all the wrapper functions and everything setup right.  Here
is my problem.  What I need to do is to return a tuple from C to

To go about doing this, I first create a tuple object in C doing the

PyObject* toRet;
toRet = PyTuple_New(num_addr);

then, in a for loop, i assign values to the tuple as follows:

for ( i = 0; i < num_addr; i++ )
        printf("%d\n", dat[i]);
        PyTuple_SET_ITEM(toRet, i, (PyObject*)dat[i] );
(dat is declared as follows: unsigned int* dat; )

then, i say return toRet at the end of my C function.

when I try to print the tuple in python, it says the memory address
0x.... could not be written, and I can see a part of the tuple
printout, which is as follows:
( <nil>,
then i get my error.

can someone please help me with this?

thanks a lot!
-- Kiran

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