Example of pyobjc implementation for Notification Center on OS X with reply option

NSmessage_alert.py

#!/usr/bin/env python

from Foundation import NSUserNotification, NSUserNotificationCenter, NSObject
from PyObjCTools import AppHelper

'''
This class is used for NSUserNotificationCenter alert. User needs to select Alerts style 
in System Preferences -> Notifications for the python script.
'''
class Notification(NSObject):
    def notify(self, title, subtitle, text):
        notification = NSUserNotification.alloc().init()
        if title : notification.setTitle_(str(title))
        notification.setSubtitle_(str(subtitle))
        notification.setInformativeText_(str(text))
        notification.setHasReplyButton_ (1)
        # Use this if sound is needed
        #notification.setSoundName_("NSUserNotificationDefaultSoundName")
        NSUserNotificationCenter.defaultUserNotificationCenter().setDelegate_(self)
        NSUserNotificationCenter.defaultUserNotificationCenter().scheduleNotification_(notification)
        
    def userNotificationCenter_didActivateNotification_(self, center, notification):
        alertType = 3 # activationType from Apple documentation
        if notification.activationType() is alertType:
            response = notification.response()
            print(response.string())
            # Stop the loop
            AppHelper.stopEventLoop()

def main():
    notify_obj = Notification.alloc().init()
    notify_obj.notify('Title','Subtitle','Some nice text')
    # Loop for delegate call
    AppHelper.runConsoleEventLoop()
    # Do other stuff here. Like:
    print('Done')

if __name__ == "__main__":
    main()