无法提取语音到文本转换中的音频文件

Question

每当我尝试运行我的代码时，它都会说：[Errno 2] No such file or directory: 'speechtotext.wav'，尽管我已将文件以正确的格式保存在计算机上。

这是我的代码：

import speech_recognition as sr

Audio_file= ("speechtotext.wav")

r=sr.Recognizer()

with sr.AudioFile(Audio_file) as source:
    audio=r.record(source)

try:
    print("audio file contains:" + r.recognize_google( audio))
except sr.UnknownValueError:
    print("Google Speech Recognition could not understand")
except sr.RequestError:
    print("couldn't get results from Google Speech Regonition")

谁能告诉我怎么了？我该如何解决？