API/C memory mananegemnt problem

fumana at lambrate.inaf.it fumana at lambrate.inaf.it
Fri Mar 10 09:19:29 CET 2006

Hi everybody,
I have a problem with Python/C API and memory management.

I'm using 
Python 2.3.5 (#1, Jan  4 2006, 16:44:27)
[GCC 4.0.2 20050901 (prerelease) (SUSE Linux)] on linux2

In my C-module I have a loop like this:

int size=10000000;

output=(double *) calloc(size, sizeof(double));


for(i=0; i<size; i++){
  PyList_Append(py_output, tmp); 


return py_output;


It returns to python module a (very large) list.

Problem: when I delete the list in python module (with python del statement) 
not all memory is relased.

It look like all 10000000 tmp PyFloat allocated in C code 
remain stored in memory.

Somebody can help me?



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