title: python import successful in one terminal but fails in another
body: <p>I downloaded and installed (build + make) a cython package, <a href="http://github.com/uoip/g2opy" rel="nofollow noreferrer">g2opy</a> successfully. And when I tried checking if everything went well, I get this:</p>
  
  <pre><code>(cv) clmno@machine:~/OpenSource/python/g2opy$ python
  Python 3.4.5 |Continuum Analytics, Inc.| (default, Jul  2 2016, 17:47:47) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import g2o
  &gt;&gt;&gt; import numpy
  &gt;&gt;&gt; import cv2
  </code></pre>
  
  <p>So, I assume everything is fine and opened another terminal window. And tried importing the same module, but failed:</p>
  
  <pre><code>(cv) clmno@machine:~$ python
  Python 3.4.5 |Continuum Analytics, Inc.| (default, Jul  2 2016, 17:47:47) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import g2o
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named 'g2o'
  </code></pre>
  
  <p>Has this to do with the shared library (.so file)? If it was successfully imported, why would it fail the next time?</p>