title: Python 3to2 Tool - Requires At Least
body: <p>So, I'm using <code>3to2</code> to port my Python 3.3 code back to version 2.x.  I, believe, I correctly installed 3to2 by downloading the .tar.gz, <code>cd</code> to the file and running <code>python3.3 setup.py build</code> and then <code>python3.3 setup.py install</code>, so I don't think that is what is causing the issue.</p>
  
  <p>The issue:  the issue is that after I <code>cd</code> to the correct file, with the code I wish to use <code>3to2</code> on, I run <code>3to2 filename.py</code>, which then returns the following:</p>
  
  <pre><code> Checking Python version info...
   ERROR: 3to2 requires at least Python 2.7 in the 2.x branch.
  </code></pre>
  
  <p>Now, I have Python 3.3 installed, which I did myself and Python 2.7, which came pre-installed on my [Mac - OSX Lion 10.7.3] computer.  Any ideas why this may be?  Thanks!</p>