Import WordNet In NLTK

I want to import wordnet dictionary but when i import Dictionary form wordnet i see this error :

 for l in open(WNSEARCHDIR+'/lexnames').readlines():
IOError: [Errno 2] No such file or directory: 'C:\\Program Files\\WordNet\\2.0\\dict/lexnames'

I install wordnet2.1 in this directory but i cant import please help me to solve this problem

import nltk
from nltk import *
from nltk.corpus import 开发者_如何学JAVAwordnet
from wordnet import Dictionary

print '-----------------------------------------'
print Dictionary.length

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The following works for me:

>>> nltk.download()
# Download window opens, fetch wordnet
>>> from nltk.corpus import wordnet as wn

Now I've a WordNetCorpusReader called wn. I don't know why you're looking for a Dictionary class, since there's no such class listed in the docs. The NLTK book, in section 2.5, explains what you can do with the nltk.corpus.wordnet module.

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You should try these commands:

import nltk
nltk.download('wordnet')

It worked for me.