def _init_menu_bar(self) -> None:
exit_action = QAction(QIcon('exit.png'), '&Exit', self)
exit_action.setShortcut('Ctrl+Q')
exit_action.setStatusTip('Exit application')
exit_action.triggered.connect(qApp.quit)
menu_bar = self.widget.menuBar()
file_menu = menu_bar.addMenu('&File')
file_menu.addAction(exit_action)
edit_menu = menu_bar.addMenu('&Edit')
edit_menu.addAction(exit_action)
view_menu = menu_bar.addMenu('&View')
view_menu.addAction(exit_action)
about_menu = menu_bar.addMenu('&About')
about_menu.addAction(exit_action)
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