title: Conda list shows a package but cannot import it
body: <p>Here an issue i'm having on a conda Virtual env. I'm using ubuntu 64b guest on windows 7 host with Virtual Box.</p>
  
  <p>So when i'm doing :</p>
  
  <pre><code>source activate MyVirtEnv
  conda list |grep visdom
  visdom                    0.1.05                        0    conda-forge
  </code></pre>
  
  <p>Seems to be installed right ?
  Next step :</p>
  
  <pre><code>python
  Python 3.5.3 |Anaconda custom (64-bit)| (default, Mar  6 2017, 11:58:13) 
  [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 visdom
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named 'visdom'
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Ok, here i'm lost. Why does python does not recognize this package (and it's not the only one). I'm still in my env activated when executing python.</p>
  
  <p>I'm quite new to python so perhaps i'm missing a huge mistake, please be kind :D</p>
  
  <p>Thanks for your help on this one !</p>
  
  <p>Update 1 : </p>
  
  <pre><code>deeplearning@deep-learning-virtual-machine:~$ source activate universe
  (universe) deeplearning@deep-learning-virtual-machine:~$ python
  Python 3.5.3 |Anaconda custom (64-bit)| (default, Mar  6 2017, 11:58:13) 
  [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 sys
  &gt;&gt;&gt; sys.path
  ['', '/home/deeplearning/anaconda3/envs/universe/lib/python35.zip', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5/plat-linux', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5/lib-dynload', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5/site-packages', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5/site-packages/Sphinx-1.5.6-py3.5.egg', '/home/deeplearning/gym', '/home/deeplearning/anaconda3/envs/universe/lib/python3.5/site-packages/torchvision-0.1.9-py3.5.egg']
  &gt;&gt;&gt; sys.executable
  '/home/deeplearning/anaconda3/envs/universe/bin/python'
  &gt;&gt;&gt; 
  </code></pre>