[Python] Python pyttsx, how to use external loop

In my program I need class(which can be some thread) to check some list like "say_list" and when other classes add some text to it, pyttsx say that text. I search in pyttsx docs and I find some external loops feature but I can not find example which work correctly. I want something like this:

import pyttsx
import threading

class VoiceAssistant(threading.Thread):
def __init__(self):
super(VoiceAssistant, self).__init__()
self.engine = pyttsx.init()
self.say_list = []

def add_say(self, msg):
self.say_list.append(msg)

def run(self):
while True:
if len(self.say_list) > 0:
self.engine.say(self.say_list[0])
self.say_list.remove(self.say_list[0])


if __name__ == '__main__':
va = VoiceAssistant()
va.start()


Thanks.

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