Prints out the origin, dimensions, and scaling factor for each screen, indicating which is the main screen

macos-screeninfo.py

#!/usr/bin/python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import sys
from AppKit import NSScreen

def print_screen(name, screen):
    print("%20s: scale:%.0f at origin (%6d, %6d) with size %5d by %5d" %
            (name,
                screen.backingScaleFactor(),
                screen.frame().origin.x,
                screen.frame().origin.y,
                screen.frame().size.width,
                screen.frame().size.height))

def main():
    mainScreen = NSScreen.mainScreen()
    i = 0
    for screen in NSScreen.screens():
        name = "Screen" + str(i)
        if screen == mainScreen:
            name = "(main) " + name
        print_screen(name, screen)
        i = i + 1
    sys.exit(0)

if __name__ == '__main__':
    main()