title: pyqt changing the color of a button when pressed using a stylesheet
body: <p>i am trying to change the color of a button when is press,  and look like it can be done directly with in the stylesheet with out to do a function and then connect it.</p>
  
  <p>in 
  <a href="http://qt.developpez.com/doc/4.7-snapshot/stylesheet-examples/" rel="nofollow">http://qt.developpez.com/doc/4.7-snapshot/stylesheet-examples/</a>
  show this example:</p>
  
  <pre><code>QPushButton#evilButton {
      background-color: red;
      border-style: outset;
      border-width: 2px;
      border-radius: 10px;
      border-color: beige;
      font: bold 14px;
      min-width: 10em;
      padding: 6px;
  }
  QPushButton#evilButton:pressed {
      background-color: rgb(224, 0, 0);
      border-style: inset;
  }
  </code></pre>
  
  <p>how can translate that to python pyqt?</p>