While using pyttsx3, when i tried to change voice between David and Zira It was speaking in David voice only

Question

import pyttsx3

engine = pyttsx3.init('sapi5')

voices = engine.getProperty('voices')

engine.setProperty('voices',voices[1].id)

def speak(a):

engine.say(a)

engine.runAndWait()

speak('Hello Bro, How are you?')

#After restarting my pc also didn't affect anything. I get David voice only but when i used print(voices[0].id) and print(voices[1].id) the #output in terminal was coming different. Please help me through this problem.