Pop-up a message from an ArcGIS python toolbox using ctypes

PopupMessage.pyt

import ctypes


class Toolbox(object):
    def __init__(self):
        self.label = "popup message dev"
        self.alias = "pupMesg_dev"
        self.tools = [PopupMessage]


class PopupMessage(object):

    def __init__(self):
        self.label = "How do we popup messages?"
        self.description = "Simple windll popup message example"
        self.canRunInBackground = True
        return

    def getParameterInfo(self):
        params = None
        return params

    def isLicensed(self):
        return True

    def updateParameters(self, parameters):
        return

    def udateMessages(self, parameters, messages):
        return

    def execute(self, parameters, messages):
        """Popup a message using ctype call to windll"""
        # This is a very simple way to pop up messages.
        text = "This is the message"
        title = "This is the title of the window"
        ctypes.windll.user32.MessageBoxA(0, text, title, 1)

        return