Can't get iterator in the C API
MRAB
python at mrabarnett.plus.com
Tue Feb 8 21:10:51 EST 2022
On 2022-02-09 01:12, Jen Kris via Python-list wrote:
> I am using the Python C API to load the Gutenberg corpus from the nltk library and iterate through the sentences. The Python code I am trying to replicate is:
>
> from nltk.corpus import gutenberg
> for i, fileid in enumerate(gutenberg.fileids()):
> sentences = gutenberg.sents(fileid)
> etc
>
> where gutenberg.fileids is, of course, iterable.
>
> I use the following C API code to import the module and get pointers:
>
> int64_t Call_PyModule()
> {
> PyObject *pModule, *pName, *pSubMod, *pFidMod, *pFidSeqIter,*pSentMod;
>
> pName = PyUnicode_FromString("nltk.corpus");
> pModule = PyImport_Import(pName);
>
> if (pModule == 0x0){
> PyErr_Print();
> return 1; }
>
> pSubMod = PyObject_GetAttrString(pModule, "gutenberg");
> pFidMod = PyObject_GetAttrString(pSubMod, "fileids");
> pSentMod = PyObject_GetAttrString(pSubMod, "sents");
>
> pFidIter = PyObject_GetIter(pFidMod);
> int ckseq_ok = PySeqIter_Check(pFidMod);
> pFidSeqIter = PySeqIter_New(pFidMod);
>
> return 0;
> }
>
> pSubMod, pFidMod and pSentMod all return valid pointers, but the iterator lines return zero:
>
> pFidIter = PyObject_GetIter(pFidMod);
> int ckseq_ok = PySeqIter_Check(pFidMod);
> pFidSeqIter = PySeqIter_New(pFidMod);
>
> So the C API thinks gutenberg.fileids is not iterable, but it is. What am I doing wrong?
>
Look at your Python code. You have "gutenberg.fileids()", so the
'fileids' attribute is not an iterable itself, but a method that you
need to call to get the iterable.
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