如何在使用sr.Microphone时修复AttributeError：__enter__

Question

我编写了以下代码，以便从麦克风获取输入：

import speech_recognition as sr
import pyaudio
#import playsound
import webbrowser
from gtts import gTTS



def get_audio():
    r = sr.Recognizer()
    with sr.Microphone as source:
        audio = r.listen(source)
        said = ""

        try:
            said = r.recognize_google(audio)
            print(said)
        except Exception:
            print("Error")
    return(said)


get_audio()

但是它引发了以下错误：

line 12, in get_audio
    with sr.Microphone as source:
AttributeError: __enter__

Process finished with exit code 1

我已经安装了pyaudio（必需版本）和wheel文件，但是问题仍然存在...请帮助我摆脱这种情况...