And this one too

19-plugins/plugins-src/words2.py

@@ -0,0 +1,7 @@
+import sys, re, string
+
+def extract_words(path_to_file):
+    words = re.findall('[a-z]{2,}', open(path_to_file).read().lower())
+    stopwords = set(open('../stop_words.txt').read().split(','))
+    return [w for w in words if w not in stopwords]
+