1. 在安装了NLTK 之后，打开python 输入 import nltk ，没有报错表示安装成功过
2. 运行 nltk.download() 命令 ，会出现下载页面
经过多次下载 出错多次，终于成功
有需要的可以 @我，通过 百度网盘共享
http://pan.baidu.com/s/1bpewDAJ 提取码 4kud
下载以后解压到默认的C盘 NLTK_DATA目录下
3.输入命令
>>> from nltk.book import *
出现以下内容 ，说明环境已近装好了
*** Introductory Examples for the NLTK Book ***
Loading text1, ..., text9 and sent1, ..., sent9
Type the name of the text or sentence to view it.
Type: 'texts()' or 'sents()' to list the materials.
text1: Moby Dick by Herman Melville 1851
text2: Sense and Sensibility by Jane Austen 1811
text3: The Book of Genesis
text4: Inaugural Address Corpus
text5: Chat Corpus
text6: Monty Python and the Holy Grail
text7: Wall Street Journal
text8: Personals Corpus
text9: The Man Who Was Thursday by G . K . Chesterton 1908