Pyqt style can be configured. The default style of PyQt is called ‘Fusion’. But this isn’t the only style. You may want to distribute your app on multiple operating systems, and have a native look and feel.
If you are on Windows, you may want a Windows look. On Mac you may want the Mac OS X style. All of these can be configured. The Mac style is only available on Mac OS X.
Download PyQt examples
The available styles may differ system to system. You can get a list of available styles using the Python interpreter, like so:
The Breeze style looks like this:
You can set the style with the line
app = QApplication()
Then the window shows like this (the old Win 9x style):