title: Unable to import a module that is definitely installed
body: <p>After installing <a href="https://pypi.org/project/mechanize/" rel="noreferrer">mechanize</a>, I don't seem to be able to import it.</p>
  
  <p>I have tried installing from pip, easy_install, and via <code>python setup.py install</code> from this repo: <a href="https://github.com/abielr/mechanize" rel="noreferrer">https://github.com/abielr/mechanize</a>. All of this to no avail, as each time I enter my Python interactive I get:</p>
  
  <pre><code>Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
  [GCC 4.6.3] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import mechanize
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named mechanize
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>The installations I ran previously reported that they had completed successfully, so I expect the import to work. What could be causing this error?</p>