python - Why shows error "import nltk"? -


i trying build web crawler using python , i'v got following error when executed. 

import sys import math import re collections import ordereddict, defaultdict import os import nltk //this line shows error import pickle xml.dom import minidom xml.dom import empty_namespace import nltk  //this line shows error nltk.stem.porter import porterstemmer import time`enter code here`

how overcome problem?

first can check whether nltk have installed or not. otherwise can download here.

nltk download link

in ubuntu, can try followng one: 

sudo apt-get install python-nltk

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