importmatplotlib.pyplotaspltimportnumpyasnpt=np.arange(0.0,2.0,0.01)s=np.sin(2*np.pi*t)upper=0.77lower=-0.77supper=np.ma.masked_where(s<upper,s)slower=np.ma.masked_where(s>lower,s)smiddle=np.ma.masked_where((s<lower)|(s>upper),s)fig,ax=plt.subplots()ax.plot(t,smiddle,t,slower,t,supper)plt.show()

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