Override the closeEvent method of QWidget in your main window. For example: class MainWindow(QWidget): # or QMainWindow … def closeEvent(self, event): # do stuff if can_exit: event.accept() # let the window close else: event.ignore() Another possibility is to use the QApplication‘s aboutToQuit signal like this: app = QApplication(sys.argv) app.aboutToQuit.connect(myExitHandler) # myExitHandler is a callable
It should be enough to create an empty virtualenv and then copy the contents of the …/site-packages/PyQt4 directories into it. I suggest to install PyQt4 once globally, make a copy of the directory, uninstall it and then use this trick to create VEs.
Set the WA_StyledBackground attribute on the container widget: ui = MainWindow() ui.setupUi(mainwindow) ui.widget.setAttribute(QtCore.Qt.WA_StyledBackground, True) (PS: for performance reasons, this attribute isn’t set by default for some widget classes – but the documentation doesn’t seem to specifiy which ones).