title: In CMD "python" starts Python 3.3, "py" starts Python 2.7, how do I change this?
body: <p>Brand new Python, just getting things set up and installed before I start messing around with things. My understanding is that there are some notable differences/incompatibilities between Python 2.7 and Python 3.3, though both versions are well used, so I thought it best to install <em>both</em> (In their own install directories).</p>
  
  <p>When installing, I used the new 3.3 feature where the installer set the PATH variables for me, however this option is not present for 2.7. After installing both versions, I tried a quick test, opened command prompt, and typed <code>python</code> to bring up an interactive session, and as I hoped, it brought up python 3.3. </p>
  
  <p>I am also aware of the shorter <code>py</code> command. However when I try <code>py</code> in command prompt, it brings up python 2.7. I can use <code>py -3</code> to bring up 3.3, but that makes it longer than it needs to be, and seeing as I will be dealing primarily with version 3.3, I would like <code>py</code> <em>and</em> <code>python</code> to both bring up a Python 3.3 interactive session.</p>
  
  <p>I am somewhat familiar with Window's PATH system, but I can't see why this is happening. How can I set it up so that <em>both</em> <code>py</code> and <code>python</code>, when typed into a windows command prompt, will start a Python 3.3 interactive session unless otherwise specified, e.g. via something like <code>py -2</code>?</p>
  
  <p>Thanks.</p>