title: Python: source code string cannot contain null bytes
body: <p>I'm using Max OS X 10.10.3, and I finally got the <code>graphics.py</code> to show in Python 3, before it was saying no module existed.</p>
  
  <p>However, now when I try <code>import graphics</code>, or <code>from graphics import *</code>, I get the message: </p>
  
  <pre><code>"source code string cannot contain null bytes"
  </code></pre>
  
  <p>Does any Mac user (using Python 3) perhaps know what is wrong? Has anyone used the Zelle book and his <code>graphics.py</code> module? Thanks.</p>