title: No module named scipy.stats - Why despite scipy being installed
body: <p>How to use python and scipy to get a poissio random variable?  Wow..I installed scipy and per the docs I get No module named scipy.stats?  I am on ubuntu 12.04.  So......go figure</p>
  
  <p><a href="http://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.poisson.html" rel="noreferrer">http://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.poisson.html</a></p>
  
  <pre><code>ubuntu@ubuntu:~/Downloads$ sudo apt-get install python-scipy
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  python-scipy is already the newest version.
  0 upgraded, 0 newly installed, 0 to remove and 482 not upgraded.
  ubuntu@ubuntu:~/Downloads$ python
  Python 2.7.3 (default, Apr 10 2013, 06:20:15) 
  [GCC 4.6.3] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; from scipy.stats import poisson
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named scipy.stats
  </code></pre>