NLTK was unable to find stanford-postagger.jar! Set the CLASSPATH environment variable

Question

I am working on a project that requires me to tag tokens using nltk and python. So I wanted to use this. But came up with a few problems. I went through a lot of other already a

Answer 1

I use Jupyter Notebook with Pycharm. I tried the Run Configuration in Pycharm to set env variable, but not work. So I use os.environ to set it in the code:

import os

os.environ["CLASSPATH"] = "/yourPath/stanford-parser-full-2018-10-17:yourPath/stanford-postagger-full-2018-10-16:yourPath/stanford-ner-2018-10-16"
os.environ["STANFORD_MODELS"] = "yourPath/stanford-postagger-full-2018-10-16/models:yourPath/stanford-ner-2018-10-16/classifiers"

stanford_tagger = StanfordPOSTagger('english-bidirectional-distsim.tagger')

Hope it will help!

Answer 2

Update

The original answer was written for Stanford POS Tagger Version 3.6.0, Date 2015-12-09

There is a new Version (3.7.0, released 2016-10-31). Here's the code for the newer version:

from nltk.tag import StanfordPOSTagger
from nltk import word_tokenize

# Add the jar and model via their path (instead of setting environment variables):
jar = 'your_path/stanford-postagger-full-2016-10-31/stanford-postagger.jar'
model = 'your_path/stanford-postagger-full-2016-10-31/models/english-left3words-distsim.tagger'

pos_tagger = StanfordPOSTagger(model, jar, encoding='utf8')

text = pos_tagger.tag(word_tokenize("What's the airspeed of an unladen swallow ?"))
print(text)

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Original answer

I had the same problem (but using OS X and PyCharm), finally got it to work. Here's what I've pieced together from the StanfordPOSTagger Documentation and alvas' work on the issue (big thanks!):

from nltk.internals import find_jars_within_path
from nltk.tag import StanfordPOSTagger
from nltk import word_tokenize

# Alternatively to setting the CLASSPATH add the jar and model via their path:
jar = '/Users/nischi/PycharmProjects/stanford-postagger-full-2015-12-09/stanford-postagger.jar'
model = '/Users/nischi/PycharmProjects/stanford-postagger-full-2015-12-09/models/english-left3words-distsim.tagger'

pos_tagger = StanfordPOSTagger(model, jar)

# Add other jars from Stanford directory
stanford_dir = pos_tagger._stanford_jar.rpartition('/')[0]
stanford_jars = find_jars_within_path(stanford_dir)
pos_tagger._stanford_jar = ':'.join(stanford_jars)

text = pos_tagger.tag(word_tokenize("What's the airspeed of an unladen swallow ?"))
print(text)

Hope this helps.