安装nltk后用这个命令：from nltk.book import *

按照正常的，应该出现以下：

>>> from nltk.book import *

*** 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

>>>

但是我出现的是这个：

>>> from nltk.book import *

*** 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.

Traceback (most recent call last):

File "", line 1, in

from nltk.book import *

File "C:\Python26-B\lib\site-packages\nltk\book.py", line 22, in

text1 = Text(gutenberg.words(*melville-moby_dick.txt*))

File "C:\Python26-B\lib\site-packages\nltk\corpus\util.py", line 99, in __getattr__

self.__load()

File "C:\Python26-B\lib\site-packages\nltk\corpus\util.py", line 64, in __load

except LookupError: raise e

LookupError:

**********************************************************************

Resource u*corpora/gutenberg* not found. Please use the NLTK

Downloader to obtain the resource: >>> nltk.download()

Searched in:

- *C:\\Users\\XXXXXX/nltk_data*

- *C:\\nltk_data*

- *D:\\nltk_data*

- *E:\\nltk_data*

- *C:\\Python26-B\\nltk_data*

- *C:\\Python26-B\\lib\\nltk_data*

- *C:\\Users\\XXXXX\\AppData\\Roaming\\nltk_data*

**********************************************************************

>>>

看下面的目录就明白了，下载nltk_data时我更改了路径，而默认的搜索路径中没有我的nltk_data路径。

在 http://www.datatang.com/data/16932 中找了如下内容：

If you did not install the data to one of the above central locations, you will need to set the NLTK_DATA environment variable to specify the location of the data.  (On a Windows machine, do right click on "My Computer", select Properties > Advanced > Environment Variables > User Variables > New...)

所以在电脑属性环境变量中增加 NLTK_DATA ，设置自己的路径后，重新打开Python 问题即解决。