title: How to select Python version in PyCharm?
body: <p>I have PyCharm 1.5.4 and have used the "Open Directory" option to open the contents of a folder in the IDE.</p>
  
  <p>I have Python version 3.2 selected (it shows up under the "External Libraries" node).</p>
  
  <p>How can I select another version of Python (that I already have installed on my machine) so that PyCharm uses that version instead?</p>