AnacondaでPython3.3 ref: http://qiita.com/Lewuathe/items/10bafcd34af2da9ae28f

file0.txt

conda update conda

file1.txt

 conda create -n py33 python=3.3 anaconda

file2.txt

source ~/anaconda/bin/activate py33

file3.txt

(py33) ~
% python
Python 3.3.2 |Anaconda 1.7.0 (x86_64)| (default, Aug  5 2013, 15:07:24) 
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 

file4.txt

>>> import nltk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'nltk'
>>>