title: Python: can not import util
body: <p>While reading the code for django/forms/widgets.py, I saw:</p>
  
  <pre><code>from util import flatatt
  </code></pre>
  
  <p>To dig deeper, I tried to import the <code>util</code> module in a Python shell in my terminal, but I got an error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    ImportError: No module named util
  </code></pre>
  
  <p>This left me confused. What is wrong?</p>