frommatplotlibimportpyplotaspltimportnumpyasnpdata= [np.array( [iforiinrange(100 ) ] ) ,np.random.random(100 ) ]fig1=plt.figure()# create a mosaic with an empty_sentinel# at the END of the row.# 'sharey=True' works.subplots=fig1.subplot_mosaic("""        AB.        CDE        """ ,sharex=True ,sharey=True )subplots["A" ].plot(data[0] ,data[1] )subplots["B" ].plot(data[0] ,data[1] )subplots["C" ].plot(data[0] ,data[1] )subplots["D" ].plot(data[0] ,data[1] )subplots["E" ].plot(data[0] ,data[1] )subplots["C" ].set_xlabel('A variable' )subplots["D" ].set_xlabel('A variable' )subplots["E" ].set_xlabel('A variable' )subplots["A" ].set_ylabel('Some data' )subplots["C" ].set_ylabel('Some data' )plt.savefig('mosaic_working.pdf' )# create a mosaic with an empty_sentinel# at the start of the row.# 'sharey=True' DOESN'T work: the y ticks# are missing.fig2=plt.figure()subplots=fig2.subplot_mosaic("""        .AB        CDE        """ ,sharey=True )subplots["A" ].plot(data[0] ,data[1] )subplots["B" ].plot(data[0] ,data[1] )subplots["C" ].plot(data[0] ,data[1] )subplots["D" ].plot(data[0] ,data[1] )subplots["E" ].plot(data[0] ,data[1] )subplots["C" ].set_xlabel('A variable' )subplots["D" ].set_xlabel('A variable' )subplots["E" ].set_xlabel('A variable' )subplots["A" ].set_ylabel('Some data' )subplots["C" ].set_ylabel('Some data' )plt.savefig('mosaic_not_working.pdf' )