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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import scipy
import matplotlib.pyplot as plt
import scipy.io.wavfile

sample_rate, X = scipy.io.wavfile.read('audio.wav')
print (sample_rate, X.shape )
plt.specgram(X, Fs=sample_rate, xextent=(0,30))


Spectrogram in R is here.