On 2022-02-10 20:00, Jen Kris via Python-list wrote:
With the help of PyErr_Print() I have it solved. Here is the final code (the
part relevant to sents):
Py_ssize_t listIndex = 0;
pListItem = PyList_GetItem(pFileIds, listIndex);
pListStrE = PyUnicode_AsEncodedString(pListItem, "UTF-8", "strict");
pListStr = PyBytes_AS_STRING(pListStrE); // Borrowed pointer
// Then: sentences = gutenberg.sents(fileid) - this is a sequence item
PyObject *c_args = Py_BuildValue("s", pListStr);
PyObject *args_tuple = PyTuple_New(1);
PyTuple_SetItem(args_tuple, 0, c_args);
pSents = PyObject_CallObject(pSentMod, args_tuple);
if ( pSents == 0x0){
PyErr_Print();
return return_value; }
As you mentioned yesterday, CallObject needs a tuple, so that was the problem.
Now it works.
You also asked why I don't just use pListStrE. I tried that and got a long
error message from PyErr_Print. I'm not far enough along in my C_API work to
understand why, but it doesn't work.
Thanks very much for your help on this.
You're encoding a Unicode string to a UTF-8 bytestring:
pListStrE = PyUnicode_AsEncodedString(pListItem, "UTF-8", "strict");
then pointing to the bytes of that UTF-8 bytestring:
pListStr = PyBytes_AS_STRING(pListStrE); // Borrowed pointer
then making a Unicode string from those UTF-8 bytes:
PyObject *c_args = Py_BuildValue("s", pListStr);
You might was well just use the original Unicode string!
Try this instead:
Py_ssize_t listIndex = 0;
pListItem = PyList_GetItem(pFileIds, listIndex);
//> pListItem?
pSents = PyObject_CallFunctionObjArgs(pSentMod, pListItem, 0);
//> pSents+?
if (pSents == 0x0){
PyErr_Print();
return return_value;
}
Feb 9, 2022, 17:40 by songofaca...@gmail.com:
On Thu, Feb 10, 2022 at 10:37 AM Jen Kris <jenk...@tutanota.com> wrote:
I'm using Python 3.8 so I tried your second choice:
pSents = PyObject_CallFunctionObjArgs(pSentMod, pListItem);
but pSents is 0x0. pSentMod and pListItem are valid pointers.
It means exception happened.
If you are writing Python/C function, return NULL (e.g. `if (pSents ==
NULL) return NULL`)
Then Python show the exception and traceback for you.
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