接着上一篇文章 机器学习之nltk download出错：Error connecting to server: [Errno -2] ，下面说一下 nltk测试包的安装及要注意的事项
>>> import nltk
>>> nltk.download()
NLTK Downloader
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d) Download l) List c) Config h) Help q) Quit
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Downloader> d
Download which package (l=list; x=cancel)?
Identifier>
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d) Download l) List c) Config h) Help q) Quit
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这里要注意：这一步的时候要选择l（list）
Downloader> l
Packages:
[ ] brown_tei........... Brown Corpus (TEI XML Version)
[ ] punkt............... Punkt Tokenizer Models
[ ] maxent_treebank_pos_tagger Treebank Part of Speech Tagger (Maximum entropy)
[ ] machado............. Machado de Assis -- Obra Completa
[ ] movie_reviews....... Sentiment Polarity Dataset Version 2.0
[ ] names............... Names Corpus,Version 1.3 (1994-03-29)
[ ] nombank.1.0......... NomBank Corpus 1.0
[ ] nps_chat............ NPS Chat
[ ] paradigms........... Paradigm Corpus
[ ] pe08................ Cross-Framework and Cross-Domain Parser
Evaluation Shared Task
[ ] pil................. The Patient Information Leaflet (PIL) Corpus
[ ] pl196x.............. Polish language of the XX century sixties
[ ] ppattach............ Prepositional Phrase Attachment Corpus
[ ] problem_reports..... Problem Report Corpus
[ ] propbank............ Proposition Bank Corpus 1.0
[ ] qc.................. Experimental Data for Question Classification
[ ] reuters............. The Reuters-21578 benchmark corpus,ApteMod
version
[ ] rte................. PASCAL RTE Challenges 1,2,and 3
Hit Enter to continue:
查看所有的包，并找到你需要的包，然后不能按照提示收入点击，而是应该这样做：
>>> nltk.download('brown_tei')
注意：该方法可能会出现：<urlopen error [Errno -2] Name or service not known>的错误，这时可使用下面的方法解决
或者使用：
python -m nltk.downloader spanish_grammars