Tutorial code : Listen Function

listen.py

import speech_recognition as sr

# Listen to user input
def listen():
    r = sr.Recognizer()
    with sr.Microphone() as source:
        speak("I'm Listening")
        print("Listening...")
        r.pause_threshold = 1
        r.adjust_for_ambient_noise(source, duration=1)
        audio = r.listen(source)
    try:
        print("Recognizing...")
        speak('Recognizing')
        query = r.recognize_google(audio, language='en-CA')
        print("User said: {}".format(query))
    except sr.UnknownValueError:
        print("I cannot hear you")
        speak("I cannot hear you")
    except sr.RequestError:
        print("Say that again please")
        speak("Say that again please")
        return "None"
    return query

I will be running the python script on a RaspberryPi OS Lite equipped Raspberry Pi Zero W