Installing nltk3 for Python3 in virtual environment on Linux

[Last update: 04/01/2015]

Prerequisites: Install Python and set up virtual environment & Install pip in virtual environment
Tested on: Xubuntu 12.04 LTS / 13.10 / 14.04 LTS (64-bit) with ActivePython installed in /opt

(skip, if activated) Activate the virtual environment you would like to install nltk (v3) in:

```
cd ~/venv/apy3341
source bin/activate
```

Use pip to install the latest version of nltk:

```
(apy3341):~$ pip install -U nltk
```

[January 2015] Workaround for users with setuptools versions >=10 (see NLTK Issue #824):

(apy3341):~$ pip install setuptools==9.1
(apy3341):~$ pip install -U nltk

(skip, if nltk_data already present on system) Start Python interpreter in virtual environment and download nltk_data (corpora, packages & models):

(apy3341) mki@ubuntu:~$ python
ActivePython 3.3.4.1 (ActiveState Software Inc.) based on
Python 3.3.4 (default, Feb 25 2014, 14:59:15) 
[GCC 4.0.2 20051125 (Red Hat 4.0.2-8)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import nltk
>>> nltk.download()

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