title: pyqt4 window resize event
body: <p>I'm using python3 and pyqt4 and I want some code to run every time my <code>QMainWindow</code> is resized.I would like something like this</p>
  
  <pre><code>self.window.resized.connect(self.resize)
  </code></pre>
  
  <p>but <code>resized</code> is not a builtin function or method.
  Can anyone help.</p>