code: def notify(title, message, retcode=None):
      
      try:
          import Foundation
          import objc
      except ImportError:
          import sys
          import logging
  
          logger = logging.getLogger(__name__)
          if sys.platform.startswith('darwin') and hasattr(sys, 'real_prefix'):
              logger.error(
                  "Using ntfy with the MacOS Notification Center doesn't "
                  "work within a virtualenv")
              sys.exit(1)
          else:
              raise
  
      NSUserNotification = objc.lookUpClass('NSUserNotification')
      NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')
  
      notification = NSUserNotification.alloc().init()
      notification.setTitle_(title)
      if message is not None:
          notification.setInformativeText_(message)
      notification.setDeliveryDate_(Foundation.NSDate.date())
  
      NSUserNotificationCenter.defaultUserNotificationCenter()\
          .scheduleNotification_(notification)
docs: adapted from https://gist.github.com/baliw/4020619