title: Setting flags to make an item unselectable and later, selectable again
body: <p>I am learning PySide and I was confused how to set the flag for a QListWidget item back to selectable after first setting it to unselectable. I know I can:</p>
  <pre><code>QListWidget.SetFlags(QtCore.Qt.ItemIsSelectable)
  </code></pre>
  <p>I am a bit unsure why the flag is named, &quot;ItemIsSelelectable&quot; when it seems to make the item unselectable. But I wanted to set the item back to selectable after setting this flag.</p>