Do something?

main.py

@@ -8,5 +8,36 @@
 # Distributed under terms of the MIT license.
 #
 
+import PyQt5.QtGui as qtg
+import PyQt5.QtWidgets as qtw
+import sys
 
+class BadWitch:
+    def __init__(self, Argv):
+        # Initialize UI
+        self.app = qtw.QApplication(Argv)
+        self.main_window = qtw.QMainWindow()
+        # Initialize a UI helper
+        self.ui = Ui_MainHelper()
+        # Build the application
+        self.ui.create_actions(self.app, self.main_window)
+        self.ui.create_menus(self.app, self.main_window)
+        self.ui.build_mainwindow(self.app, self.main_window)
+    def show_application(self):
+        self.main_window.show()
+        self.app.exec_()
+
+class Ui_MainHelper:
+    def create_actions(self, App, MainWindow):
+        self.action_exit = qtw.QAction(qtg.QIcon.fromTheme("application-exit"), "Quit")
+        self.action_exit.triggered.connect(App.closeAllWindows)
+    def create_menus(self, App, MainWindow):
+        self.menu_file = qtw.QMenu("File")
+    def build_mainwindow(self, App, MainWindow):
+        self.menu_file.addAction(self.action_exit)
+        MainWindow.menuBar().addMenu(self.menu_file)
+
+if __name__ == "__main__":
+    bw = BadWitch(sys.argv)
+    bw.show_application()