def getIDFValue(): str = '' word = request.args.get('zbor') rows = IDFModel.query(IDFModel.word == word).fetch() if rows is not None and len(rows) > 0: str += 'IDF value for word %s is %f\n' % (word, rows[0].value) else: str += 'No IDF Value for word %s\n' % word return Response(str, mimetype='text/plain')