为什么我的 pyttsx3 不产生任何声音？

Question

我正在开发一个文本到语音程序，你说了什么，它会在字典中找到它，并在字典中用它的匹配项进行回复。输入一切正常并且工作正常，但是这不会产生任何声音。没有错误。这是我的代码：

import speech_recognition as sr
import os
import sys
import pyttsx3
devnull = os.open(os.devnull, os.O_WRONLY)
old_stderr = os.dup(2)
sys.stderr.flush()
os.dup2(devnull, 2)
os.close(devnull)

def say(sp):
    engine = pyttsx3.init()
    engine.say(sp)
    engine.runandwait()
    
    
    
def get_audio_and_reply():
    r = sr.Recognizer()
    with sr.Microphone() as source:
        audio = r.listen(source)
        said = ""

        try:
            said = r.recognize_google(audio)
            print("You: " + said)
            what_to_say={"hi":"Hello",
                         "hello":"Hi" ,
                         "hi neuron":"Hello",
                         "hello neuron":"Hi",
                         "what's your name":"Neuron",
                         "what is your name":"Neuron",
                         "how are you":"I do not know because I do not have feelings!"
                         }
            try:
                say(what_to_say[said])
            except:
                say("I do not, as of yet, understand this")
        except:
            pass



while True:    
    get_audio_and_reply()

有人有解决办法吗？