title: (Xcode and Python) error: unrecognized arguments: -NSDocumentRevisionsDebugMode
body: <p>I'm using Xcode with a custom debugging scheme to debug my Python program.  Under "Edit Scheme", I selected Python as the executable, but when I debug the program, I see an error due to unrecognized command line arguments.</p>
  
  <pre class="lang-none prettyprint-override"><code>error: unrecognized arguments: -NSDocumentRevisionsDebugMode
  </code></pre>
  
  <p>Where is that <code>NSDocumentRevisionsDebugMode</code> argument coming from? Why is Xcode adding that to the command line argument list?</p>