how to fix speech recognition in python

1import speech_recognition as sr
2r = sr.Recognizer()
3with sr.Microphone() as source:                # use the default microphone as the audio source
4    audio = r.listen(source)                   # listen for the first phrase and extract it into audio data
5
6try:
7    print("You said " + r.recognize(audio))    # recognize speech using Google Speech Recognition
8except LookupError:                           # speech is unintelligible
9    print("Could not understand audio")
10