René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"TypeError: unsupported operand type(s) for +: 'int' and 'str'","articleBody":"I see the following error when running [ch04/blei_lda.py](https://github.com/luispedro/BuildingMachineLearningSystemsWithPython/blob/master/ch04/blei_lda.py)\r\n```\r\n---------------------------------------------------------------------------\r\nTypeError                                 Traceback (most recent call last)\r\n\u003cipython-input-2-5511c9e27cd2\u003e in \u003cmodule\u003e()\r\n     37 for ti in range(model.num_topics):\r\n     38     words = model.show_topic(ti, 64)\r\n---\u003e 39     tf = sum(f for f, w in words)\r\n     40     with open('topics.txt', 'w') as output:\r\n     41         output.write('\\n'.join('{}:{}'.format(w, int(1000. * f / tf)) for f, w in words))\r\n\r\nTypeError: unsupported operand type(s) for +: 'int' and 'str'\r\n\r\n```\r\n\r\nI think, since the frequency, f, and word, w,  are the opposite on words, did you want to write **w, f in words** instead, as in the following?\r\n```\r\n     39     tf = sum(f for w, f in words)\r\n     40     with open('topics.txt', 'w') as output:\r\n     41         output.write('\\n'.join('{}:{}'.format(w, int(1000. * f / tf)) for w, f in words))\r\n```","author":{"url":"https://github.com/masayas","@type":"Person","name":"masayas"},"datePublished":"2017-03-12T02:37:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/21/BuildingMachineLearningSystemsWithPython/issues/21"}