No sound after running engine.runandWait()

Question

I am trying to work with the pyttx3 library and I am trying to output speech by supplying a text to engine.say('My text'), then I run the engine.runandwait() function but the program just stays there and does nothing.

Here is my code:

import pyttsx3

def speak(audio):
    engine.say(audio)
    engine.runAndWait()


engine = pyttsx3.init('sapi5')
voices = engine.getProperty('voices')
engine.setProperty('voice', voices[0].id)
speak("Best")