NLTK Lookup Error

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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?

python-2.7 nltk python
10 Answers

Install all nltk resources in one line:

python3 -c "import nltk; nltk.download('all')"

the data will be saved at ~/nltk_data

Install only specific resource:

Substitute "all" for "averaged_perceptron_tagger" to install only this module.

python3 -c "import nltk; nltk.download('averaged_perceptron_tagger')"
user_40751550

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()
user_22754390

Sometimes even by writing nltk.download('module_name'), it does not get downloaded. At those times, you can open python in interactive mode and then download by using nltk.download('module_name').

user_47793900

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

user_142484470 
import nltk


nltk.download('vader_lexicon')

Use this this might work

user_151231720

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

import nltk
nltk.download('all')
user_14851760
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