[Python] How to record system audio in python

I tried to record audio with this code:

import sounddevice
from scipy.io.wavfile import write
fs = 44100
second = 3
file = sounddevice.rec(int(second * fs), samplerate=fs, channels=2)
sounddevice.wait()
write('output.wav', fs, file)


but it only records output of mic while i want to record system media sound

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