为什么在这种情况下使用OOP使用语音识别？

Question

我正在尝试使用OOP使用语音识别。我尝试从此github 转换过程代码。

import speech_recognition as sr #recognise speech
import time


class SpeechRecognition():
    def __init__(self):
        self.r = sr.Recognizer() #initialize recognizer that is responsible for recognizing the speech
            
    # listen for audio and convert it to text:
    def record_audio(self, ask=False):
        with sr.Microphone() as source: # microphone as source
            if ask: 
                print(ask)
            audio = self.r.listen(source) # listen for the audio via source
            voice_data = ''
            try:
                voice_data = self.r.recognize_google(audio, language='sv-SE') # convert audio to text
            except sr.UnknownValueError: # error: recognizer does not understand
                print('Hörde inte det') 
            except sr.RequestError: # error: recognizer is not connected
                print('Ledsen, tjänsten är nere')
            print(f">> {voice_data.lower()}") # print what user said
            return voice_data.lower()

    def init_speech_recognizer(self):
        time.sleep(1)
        print('Hur kan jag hjälpa dig?')

        while 1: #this will let it keep listen 
            voice_data = self.record_audio("Recording") # get the voice input
            print("Done")
            
speechObj = SpeechRecognition()
speechObj.init_speech_recognizer()

输出是：

Hur kan jag hjälpa dig?
Recording

但是我说什么都没打印。为什么这是？