python 2.7 - nltk - still old version after upgrading -

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i trying install latest version of nltk. used pip , in /usr/local/lib/python2.7/dist-packages get

>>> import nltk ; nltk.__version__ '3.1'

but in project directory get

>>> import nltk ; nltk.__version__ '2.0b9'

how can change use nltk 3.1?


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