Can't get iterator in the C API

[Jen Kris]

Thank you for clarifying that.  Now on to getting the iterator from the method.  

Jen


Feb 8, 2022, 18:10 by python at mrabarnett.plus.com:

> 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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