Python code not running properly on Mac OS X (10.8) but works on Windows 7, why?

Question

I'm learing Python using the book "Introduction to Programming Using Python (Pearson 2013)". I use PyCharm 2.7 on my Mac OS X (10.8) to write Pyhon 3 code.

The following code (Create a GUI with tkinter and add a popup menu) does not run properly on my Mac OS X. The problem is that the popup menu doesn't show when pressing the right mouse click. I tested the code on my Windows 7 VM and in Windows 7 it works perfectly.

So my question is: why does the code work on Windows 7 but not on Mac OS X?

Here's the code:

from tkinter import *

class PopupMenuDemo:
    def __init__(self):
        window = Tk()
        window.title("Popup Menu Demo")

        # Create a popup menu
        self.menu = Menu(window, tearoff = 0)
        self.menu.add_command(label = "Draw a line", command = self.displayLine)
        self.menu.add_command(label = "Draw an oval", command = self.displayOval)
        self.menu.add_command(label = "Draw a rectangle", command = self.displayRectangle)
        self.menu.add_command(label = "Clear", command = self.clearCanvas)

        # Place canvas in window
        self.canvas = Canvas(window, width = 200, height = 100, bg = "white")
        self.canvas.pack()

        # Bind popup to canvas
        self.canvas.bind("<Button-3>", self.popup)

        window.mainloop()

    # Display a rectangle
    def displayRectangle(self):
        self.canvas.create_rectangle(10, 10, 190, 90, tags = "rectangle")

    def displayOval(self):
        self.canvas.create_oval(10, 10, 190, 90, tags = "oval")

    def displayLine(self):
        self.canvas.create_line(10, 10, 190, 90, tags = "line")
        self.canvas.create_line(10, 90, 190, 10, tags = "line")

    def clearCanvas(self):
        self.canvas.delete("rectangle", "oval", "line")

    def popup(self, event):
        self.menu.post(event.x_root, event.y_root)

PopupMenuDemo()

Answer 1

Solution

To make the code work properly in Mac OS X here's what has to be done.

Change:

self.canvas.bind("<Button-3>", self.popup)

To:

self.canvas.bind("<Button-2>", self.popup)

Button-3 is the middle click button while Button-2 is the secondary click button.

To make it work in Windows, use Button-3.