What is NLTK POS tagger asking me to download?

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From NLTK versions higher than v3.2, please use:

>>> import nltk
>>> nltk.__version__
'3.2.1'
>>> nltk.download('averaged_perceptron_tagger')
[nltk_data] Downloading package averaged_perceptron_tagger to
[nltk_data]     /home/alvas/nltk_data...
[nltk_data]   Package averaged_perceptron_tagger is already up-to-date!
True

For NLTK versions using the old MaxEnt model, i.e. v3.1 and below, please use:

>>> import nltk
>>> nltk.download('maxent_treebank_pos_tagger')
[nltk_data] Downloading package maxent_treebank_pos_tagger to
[nltk_data]     /home/alvas/nltk_data...
[nltk_data]   Package maxent_treebank_pos_tagger is already up-to-date!
True

For more details on the change in the default pos_tag, please see https://github.com/nltk/nltk/pull/1143

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