title: What's the suitable widget in PyQt to create a floating widget on the desktop?
body: <p>I'd like to create something very alike to Rainlendar with python.
  Currently I'm using PyQt for GUI, but there doesn't seem to be a widget type that can directly display something like that, specifically I mean:</p>
  
  <ol>
  <li>No edge displayed, incuding buttons on the top right corner.</li>
  <li>No corresponding bar in the task bar.</li>
  <li>Able to display a icon in the icon area in the bottom right corner of the desktop.</li>
  </ol>
  
  <p>Is there any widget capable of this ?
  Or can I do some modification to any existing widget to achieve this ?</p>
  
  <p>Thanks.</p>