Pyttsx3 set volume

How to change the rate of speech in pyttsx3

import pyttsx3

engine = pyttsx3.init()
engine.setProperty("rate", 178)
engine.say("I am the text spoken after changing the speech rate.")
engine.runAndWait()

Pyttsx3 set volume

import pyttsx3

engine = pyttsx3.init()

new_vol = .5 #volume between 0 and 1
engine.setProperty("volume", new_vol)

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