用python写一个Ai语音助手小程序，显示代码

下是一个简单的Python语音助手小程序示例，它使用SpeechRecognition库和pyttsx3库来识别和生成语音：

import speech_recognition as sr
import pyttsx3

# initialize speech recognition engine
r = sr.Recognizer()

# initialize text-to-speech engine
engine = pyttsx3.init()

# obtain audio from the microphone
with sr.Microphone() as source:
    print("Speak:")
    audio = r.listen(source)

# recognize speech using Google Speech Recognition
try:
    print("You said: " + r.recognize_google(audio))
    engine.say("You said: " + r.recognize_google(audio))
    engine.runAndWait()
except sr.UnknownValueError:
    print("Could not understand audio")
    engine.say("Sorry, I could not understand what you said.")
    engine.runAndWait()
except sr.RequestError as e:
    print("Could not request results from Google Speech Recognition service; {0}".format(e))
    engine.say("Sorry, there was an error in processing your request.")
    engine.runAndWait()

这个程序会启动麦克风，等待用户输入语音。一旦用户说话，程序会使用Google Speech Recognition API将语音转换为文本，并将其打印到屏幕上。同时，使用pyttsx3库，程序还会将文本转换为语音，然后将其播放出来。