title: How to debug ImportEror "No Module named ..."
body: <p>I am using Django Rest Framework. When I try to go to the swagger docs page, 
  I am getting 
  ImportError: No module named drf_compound_fields</p>
  
  <pre><code>from  serializers.py where I try to import the following
  
  from drf_compound_fields.fields import ListField
  </code></pre>
  
  <p>I have drf-compound-field 0.2.2 in my virtualenv and I ran pip list command to make sure that it is installed.</p>
  
  <p>Here is what I get from manage.py shell</p>
  
  <pre><code> Python 2.7.6 (default, Mar 22 2014, 22:59:56)   
  [GCC 4.8.2] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  (InteractiveConsole)
  &gt;&gt;&gt; 
  &gt;&gt;&gt; 
  &gt;&gt;&gt; 
  &gt;&gt;&gt; 
  &gt;&gt;&gt; from drf_compound_fields.fields import ListField
  Traceback (most recent call last):
  File "&lt;console&gt;", line 1, in &lt;module&gt;
  ImportError: No module named drf_compound_fields.fields
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Thanks for your help!!</p>