PyQt inner widget consists of menu bar and bottom widget(whatever the widget is) naturally.
PyQt5 >= 5.8
pip3 install git+https://github.com/yjg30737/pyqt-top-menu-bottom-widget.git --upgrade
Code Sample
from PyQt5.QtWidgets import QApplication
from pyqt_top_menu_bottom_widget.topMenuBottomWidget import TopMenuBottomWidget
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
slider = TopMenuBottomWidget()
slider.show()
app.exec_()
Result
A and B are QPushButtons, bottom widget is QGraphicsView.