python - matplotlib: share x-axis for two barcharts, each with 4 groups -

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i trying create figure 2 barcharts using matplotlib. each barchart has 4 groups of bars. current python code using follows:

fig,ax=plt.subplots() bar_width=0.15  rects1 = plt.bar(index, group0, bar_width,                   alpha=opacity,                  color='b',                   label='1')  rects2 = plt.bar(index + bar_width, group1, bar_width,                   alpha=opacity,                  color='r',                   label='2')  rects3 = plt.bar(index + bar_width+bar_width, group2, bar_width,                   alpha=opacity,                  color='c',                   label='3')  rects4 = plt.bar(index + bar_width+bar_width+bar_width, group3, bar_width,                   alpha=opacity,                  color='m',                   label='4')

after formatting, plot obtain follows:

enter image description here

now, have 2 such barcharts , want them share x-axis.

enter image description here

i can't figure out way achieve this. appreciated.

thanks

as suggested mel, calling bar() multiple times on same axes worked in case. working code this:

fig,ax=plt.subplots(2,1,sharex=true) ax1 = plt.subplot(2, 1, 1) a=ax1.bar(index, rating0,width=0.15,alpha=opacity,                  color='c'                   ) index=map(lambda x:x+0.15, index) b=ax1.bar(index,rating1,width=0.15,alpha=opacity,                  color='r') index=map(lambda x:x+0.15, index) c=ax1.bar(index,rating2,width=0.15,alpha=opacity,                  color='y') index=map(lambda x:x+0.15, index) d=ax1.bar(index,rating3,width=0.15,alpha=opacity,                  color='m')  index=map(lambda x:x-0.45, index) ax2 = plt.subplot(2, 1, 2, sharex=ax1) ax2.bar(index, rating0paris,width=0.15,alpha=opacity,                  color='c') index=map(lambda x:x+0.15, index) ax2.bar(index,rating1paris,width=0.15,alpha=opacity,                  color='r') index=map(lambda x:x+0.15, index) ax2.bar(index,rating2paris,width=0.15,alpha=opacity,                  color='y') index=map(lambda x:x+0.15, index) ax2.bar(index,rating3paris,width=0.15,alpha=opacity,                  color='m')  axes in ax:     format_axes(axes)

also attaching obtained figure reference: subplots barcharts


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