[Python] Calling python function from C

I am having trouble making a simple "Hello World" python function which I can call from a C program.

Here is the contents of my helloworld.py file:

def hw():
print("Hello World")


Here is the contents of the caller.pyx file:

from helloworld import hw

cdef public void call_hw():
hw()


And here is the contents of my main.c file:

#include <Python.h>
#include "caller.h"

int
main()
{
Py_Initialize();
call_hw();
Py_Finalize();
}


Here are the commands I do:

> cython caller.pyx
> gcc -g -Wall -I/usr/include/python3.12 -c caller.c
> gcc -g -Wall -I/usr/include/python3.12 -c main.c
> gcc -g -Wall -I/usr/include/python3.12 -o main *.o -lpython3.12
> ./main
Segmentation fault (core dumped)


Here is a backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x0000555555558898 in __Pyx__GetModuleGlobalName (name=0x0) at caller.c:2739
2739 result = _PyDict_GetItem_KnownHash(__pyx_d, name, ((PyASCIIObject *) name)->hash);
(gdb) bt
#0 0x0000555555558898 in __Pyx__GetModuleGlobalName (name=0x0) at caller.c:2739
#1 0x0000555555556d9a in call_hw () at caller.c:2002
#2 0x000055555555cef6 in main () at main.c:8


Can anyone tell me what I'm doing wrong?

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