title: Can't import NLTK in Jupyter Notebook
body: <p>I <em>can</em> import the nltk package when running python or ipython from bash. So, nltk is definitely installed <em>somewhere</em> (in python from bash, 
  <code>nltk.__file__</code> is
  <code>/home/nadine/anaconda2/lib/python2.7/site-packages/nltk/__init__.pyc</code>)</p>
  
  <p>However, when using Jupyter Notebook (which I installed using Anaconda, with the 2.7 version of python), importing nltk fails:</p>
  
  <pre><code>import nltk
  ---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  &lt;ipython-input-2-b06499430ee0&gt; in &lt;module&gt;()
  ----&gt; 1 import nltk
  
  ImportError: No module named nltk
  </code></pre>
  
  <p>In Jupyter Notebook, <code>sys.executable</code> yields <code>/home/nadine/.conda/envs/py27/bin/python</code>, while in python from bash it yields <code>/home/nadine/anaconda2/bin/python2.7</code></p>
  
  <p>What exactly is going wrong here and how can I fix it?</p>