title: How can I detect a Python installation in WiX and determine the version?
body: <p>I've already found <a href="http://www.optimalbpm.se/wiki/index.php/Python_packages_from_exe_to_WiX_to_msi#The_.wxs-file" rel="nofollow">this page</a>, but it is keyed to a particular version of Python both by the compile-time variable <code>$(var.python_version)</code> and the compile-time variable <code>$(var.python_guid)</code>.</p>
  
  <p>I need to determine if <em>any</em> Python installs exist, and potentially what their versions are (in case I have a minimum version requirement, which I'm also not sure how to detect for).</p>
  
  <p>Is there a straight-forward, or any, way to do this?</p>