title: Unable to import python module
body: <p>I am working on an exercise where I need to import a python module called <code>ex25</code>.  However, I am getting the following error:</p>
  
  <pre><code>    Traceback (most recent call last):
    File "&lt;pyshell#0&gt;", line 1, in &lt;module&gt;
      import ex25
  ImportError: No module named ex25
  </code></pre>
  
  <p>I already added all possible paths to my system path variables, so I'm not sure why it won't let me <code>import</code>.</p>