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I use pip install -U nltk to install it.
After pip list I can get nltk (3.0.0).
Also sys.path includes location of nltk.
But when run import nltk, it shows ImportError: No module named nltk
I use OSX Yosemite, python2.7
I cannot figure out why it happen. Thank you for any suggestion.
You might want to try the free Anaconda distribution of Python instead. NLTK comes pre-installed in Anaconda, along with many other popular packages for data analysis, etc. It's a lot easier than having to install & manage hundreds of separate packages individually.
https://store.continuum.io/cshop/anaconda/