Log sleep/wake notifications on macOS

sleepwake.py

#!/usr/bin/python

from AppKit import NSWorkspace, \
                   NSWorkspaceWillSleepNotification, \
                   NSWorkspaceDidWakeNotification, \
                   NSObject, \
                   NSLog
from PyObjCTools import AppHelper

class NotificationHandler(NSObject):
    def receiveSleepNotification_(self, notification):
        NSLog('receiveSleepNotification: %@', notification)

    def receiveWakeNotification_(self, notification):
        NSLog('receiveWakeNotification: %@', notification)

workspace           = NSWorkspace.sharedWorkspace()
notificationCenter  = workspace.notificationCenter()
notificationHandler = NotificationHandler.new()
notificationCenter.addObserver_selector_name_object_(
    notificationHandler,
    'receiveSleepNotification:',
    NSWorkspaceWillSleepNotification,
    None
)
notificationCenter.addObserver_selector_name_object_(
    notificationHandler,
    'receiveWakeNotification:',
    NSWorkspaceDidWakeNotification,
    None
)

NSLog('Listening for sleep notifications....')
AppHelper.runConsoleEventLoop(installInterrupt=True)