def lemma_stem_sentence(sentence): lmtzr = WordNetLemmatizer() ls = LancasterStemmer() word_list = [] single_words = re.findall("\w+",sentence) for single_word in single_words: lemmed = lmtzr.lemmertize(single_word) stemmed = ls.stem(lemmed) if not stemmed in glob_Lucene: word_list.append(stemmed) return word_list