Lookup error nltk

While running a Python script using NLTK I got this:

Traceback (most recent call last):
  File "cpicklesave.py", line 56, in <module>
    pos = nltk.pos_tag(words)
  File "/usr/lib/python2.7/site-packages/nltk/tag/__init__.py", line 110, in pos_tag
    tagger = PerceptronTagger()
  File "/usr/lib/python2.7/site-packages/nltk/tag/perceptron.py", line 140, in __init__
    AP_MODEL_LOC = str(find('taggers/averaged_perceptron_tagger/'+PICKLE))
  File "/usr/lib/python2.7/site-packages/nltk/data.py", line 641, in find
    raise LookupError(resource_not_found)
LookupError:
**********************************************************************
  Resource u'taggers/averaged_perceptron_tagger/averaged_perceptro
  n_tagger.pickle' not found.  Please use the NLTK Downloader to
  obtain the resource:  >>> nltk.download()
  Searched in:
    - '/root/nltk_data'
    - '/usr/share/nltk_data'
    - '/usr/local/share/nltk_data'
    - '/usr/lib/nltk_data'
    - '/usr/local/lib/nltk_data'
**********************************************************************

Can anyone explain the problem?

Problem:
Lookup error when extracting count vectorizer from scikit learn. Below is code snippet.

from sklearn.feature_extraction.text import CountVectorizer
bow_transformer = CountVectorizer(analyzer=text_process).fit(X)

Solution:
Try to run the below code and then try to install the stopwords from corpora natural language processing toolkit!!

import nltk
nltk.download()

answered Feb 20, 2018 at 13:03

You can download NLTK missing module just by

import nltk
nltk.download()

This will shows the NLTK download screen.
If it shows SSL Certificate verify failed error. Then it should works by disabling SSL check with below code!

import nltk
import ssl

try:
    _create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
    pass
else:
    ssl._create_default_https_context = _create_unverified_https_context

nltk.download()

answered Apr 25, 2019 at 6:04

Sorry! if I missed other editor but this is working fine in Google Colab

import nltk
nltk.download('all')

answered Aug 25, 2022 at 13:00

answered Sep 13, 2019 at 3:05

If you have not downloaded ntlk then firstly download ntlk and then use this nltk.download('punkt') it will give you the result.

import nltk


nltk.download('vader_lexicon')

Use this this might work

answered Feb 1, 2021 at 13:40

In iPython console I typed from nltk.book import and I got several LookupErrors. Below shows the code I got.

*** 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.
---------------------------------------------------------------------------
LookupError Traceback (most recent call last)
<ipython-input-3-8446809acbd4> in <module>()
 ----> 1 from nltk.book import*

C:UsersdellAnacondalibsite-packagesnltk-3.0.3-py2.7.eggnltkbook.py in <module>()
 20 print("Type: 'texts()' or 'sents()' to list the materials.")
 21 
---> 22 text1 = Text(gutenberg.words('melville-moby_dick.txt'))
 23 print("text1:", text1.name)
 24 

 C:UsersdellAnacondalibsite-packagesnltk-3.0.3-py2.7.eggnltkcorpusutil.pyc in __getattr__(self, attr)
 97             raise AttributeError("LazyCorpusLoader object has no attribute '__bases__'")
 98 
 ---> 99         self.__load()
100         # This looks circular, but its not, since __load() changes our
101         # __class__ to something new:

 C:UsersdellAnacondalibsite-packagesnltk-3.0.3-py2.7.eggnltkcorpusutil.pyc in __load(self)
 62             except LookupError as e:
 63                 try: root = nltk.data.find('corpora/%s' % zip_name)
 ---> 64                 except LookupError: raise e
 65 
 66         # Load the corpus.

 LookupError: 
 **********************************************************************
 Resource u'corpora/gutenberg' not found.  Please use the NLTK
 Downloader to obtain the resource:  >>> nltk.download()
 Searched in:
- 'C:\Users\dell/nltk_data'
- 'C:\nltk_data'
- 'D:\nltk_data'
- 'E:\nltk_data'
- 'C:\Users\dell\Anaconda\nltk_data'
- 'C:\Users\dell\Anaconda\lib\nltk_data'
- 'C:\Users\dell\AppData\Roaming\nltk_data'
**********************************************************************

In [4]: 

Can i know why I get these errors?

asked Jun 18, 2015 at 7:20

As the NLTK book says, the way to prepare for working with the book is to open up the nltk.download() pop-up, turn to the tab «Collections», and download the «Book» collection. Do it and you can read the rest of the book with no surprises.

Incidentally you can do the same from the python console, without the pop-ups, by executing nltk.download("book")

answered Jun 18, 2015 at 22:24

Seems it searches for the data only at specific places (like mentioned in the error description). Try copying the content of nltk into one of those directories (or create one) such as D:nltk_data
This solved the issue for me (because the error would continue to show up even if the Guttenber was already downloaded since it did not find it at that place)

An excerpt from the error you get: (these are the directories among which you can choose where to place the nltk content so that it can be found)

• ‘C:Usersdell/nltk_data’
• ‘C:nltk_data’
• ‘D:nltk_data’
• ‘E:nltk_data’
• ‘C:UsersdellAnacondanltk_data’
• ‘C:UsersdellAnacondalibnltk_data’
• ‘C:UsersdellAppDataRoamingnltk_data’

answered Feb 21, 2018 at 17:42