title: What are the potential results for platform.system()
body: <p>What are the possible return values from the following command?</p>
  
  <pre><code>import platform
  print platform.system()
  </code></pre>
  
  <p>I've seen the SO <a href="https://stackoverflow.com/questions/446209/possible-values-from-sys-platform">question here</a>, which is not the same question.
  And I've looked at the <a href="https://docs.python.org/2/library/platform.html#platform.system" rel="noreferrer">docs here</a> but they only list:
  'Linux', 'Windows', or 'Java'.
  What else is there?
  Do macs return "Mac"?</p>