https://github.com/jiaaro/pydub

pip install pydub

Mac (using homebrew):

# libav
brew install libav --with-libvorbis --with-sdl --with-theora

#### OR #####

# ffmpeg
brew install ffmpeg --with-libvorbis --with-sdl2 --with-theora
Linux (using aptitude):

# libav
apt-get install libav-tools libavcodec-extra-53

#### OR #####

# ffmpeg
apt-get install ffmpeg libavcodec-extra-53

https://ffmpeg.zeranoe.com/builds/

from pydub import AudioSegment
 
 
def trans_mp3_to_wav(filepath):
 song = AudioSegment.from_mp3(filepath)
 song.export("now.wav", format="wav")