On 2022-03-07 00:32, Jen Kris via Python-list wrote:
I am using the C API in Python 3.8 with the nltk library, and I have a problem
with the return from a library call implemented with
PyObject_CallFunctionObjArgs.
This is the relevant Python code:
import nltk
from nltk.corpus import gutenberg
fileids = gutenberg.fileids()
sentences = gutenberg.sents(fileids[0])
sentence = sentences[0]
sentence = " ".join(sentence)
pt = nltk.word_tokenize(sentence)
I run this at the Python command prompt to show how it works:
sentence = " ".join(sentence)
pt = nltk.word_tokenize(sentence)
print(pt)
['[', 'Emma', 'by', 'Jane', 'Austen', '1816', ']']
type(pt)
<class 'list'>
This is the relevant part of the C API code:
PyObject* str_sentence = PyObject_Str(pSentence);
// nltk.word_tokenize(sentence)
PyObject* pNltk_WTok = PyObject_GetAttrString(pModule_mstr, "word_tokenize");
PyObject* pWTok = PyObject_CallFunctionObjArgs(pNltk_WTok, str_sentence, 0);
(where pModule_mstr is the nltk library).
That should produce a list with a length of 7 that looks like it does on the
command line version shown above:
['[', 'Emma', 'by', 'Jane', 'Austen', '1816', ']']
But instead the C API produces a list with a length of 24, and the REPR looks
like this:
'[\'[\', "\'", \'[\', "\'", \',\', "\'Emma", "\'", \',\', "\'by", "\'", \',\', "\'Jane", "\'", \',\', "\'Austen", "\'",
\',\', "\'1816", "\'", \',\', "\'", \']\', "\'", \']\']'
I also tried this with PyObject_CallMethodObjArgs and PyObject_Call without
success.
Thanks for any help on this.
What is pSentence? Is it what you think it is?
To me it looks like it's either the list:
['[', 'Emma', 'by', 'Jane', 'Austen', '1816', ']']
or that list as a string:
"['[', 'Emma', 'by', 'Jane', 'Austen', '1816', ']']"
and that what you're tokenising.
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