pip - install "sub package" Jupyter Notebook -


new programming. struggling installing packages, or calling "sub-packages" in jupyter notebook. suspect missing of basic concepts around installing packages.

i understand install package within notebook use 

! pip install --user <package>

what don't understand how install "sub-package" (feel free advise correct terminology is) such below. 

 nltk.tagger import *

here original script comes from:

if try : 

 !pip install nltk.tagger

i following error information / error 

collecting nltk.tagger not find version satisfies requirement nltk.tagger (from versions: ) no matching distribution found nltk.tagger

so first question is. how install nltk.tagger subpackage? if tagger sub-package of nltk, how come isn't installed when pip install nltk?

although error mentions version, searching online can't find reference subpackage "tagger". advice or links explaining appreciated.


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