Simple PyQt5 tutorial does not show menu bar - pyqt5

Question

The window appears but the menu bar shows only "Python3.7", which is what
it shows if I don't create a menu bar. This is taken almost verbatim from the tutorial here. MacOS High Sierra.
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QPushButton, QAction
class App(QMainWindow):
def __init__(self):
super().__init__()
self.title = 'Menu Bar'
self.left = 10
self.top = 10
self.width = 640
self.height = 480
self.initUI()
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
mainMenu = self.menuBar()
fileMenu = mainMenu.addMenu('File')
editMenu = mainMenu.addMenu('Edit')
viewMenu = mainMenu.addMenu('View')
searchMenu = mainMenu.addMenu('Search')
toolsMenu = mainMenu.addMenu('Tools')
helpMenu = mainMenu.addMenu('Help')
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())
Here is a screen shot of the Mac menu bar and the top left portion of the window:
Update: I found this question: I need help making a menu bar in PyQt5 about the same problem. I ran the code that worked for the OP and it worked! I'll try to find the difference between that code and mine and post again.

Answer 1

It's a MacOS thing. I haven't researched this issue in depth, but two things seem clear: empty menus will not display and menu items with names beginning with
"About", "Exit", "Quit", will be placed under the program menu.
Play with this under OS X:
import sys
from PyQt5.QtWidgets import QMainWindow, QApplication
class Window(QMainWindow):
def __init__(self):
super().__init__()
self.title = 'PyQt5 menu bar test'
self.initUI()
def print_change(self):
print('change')
def print_byebye(self):
print('bye bye')
def initUI(self):
self.setWindowTitle(self.title)
menubar = self.menuBar()
filemenu = menubar.addMenu('File')
""" Play with these options in Mac OS X:
confuse_me = False, False
You see a File menu with two actions "Change" and "Bye Bye" respectively
printing "change" and "bye bye". The program menu contains "Services...",
"Hide ...", "Hide Others", and "Quit ..." which exits the program.
confuse_me = True, False
The File menu contains only "Bye Bye". The "About" item appears in the program
menu and prints "change". The "Quit" item still quits.
confuse_me = False, True
The File menu containd only "Change". There is no "About" in the program menu,
and the "Quit" item prints "bye bye"
confuse_me = True, True
The program menu has "About" and "Quit" respectively printing "change" and "bye
bye". These is no File menu.
"""
confuse_me = False, False
text = "About a Boy" if confuse_me[0] else "Change"
pathaction = filemenu.addAction(text)
pathaction.triggered.connect(self.print_change)
text = "Quitting is not an Option" if confuse_me[1] else "Bye Bye"
exitaction = filemenu.addAction(text)
exitaction.triggered.connect(self.print_byebye)
if __name__ == '__main__':
app = QApplication(sys.argv)
print(sys.argv)
w = Window()
w.setGeometry(500, 300, 300, 300)
w.show()
sys.exit(app.exec_())