matplotlib罗列条形图（bottom）

代码示例：

import matplotlib.pyplot as plt
import matplotlib.font_manager as fm
import numpy as np

index = np.arange(4)
TJ = [30,66,54,45]
BJ = [70,56,64,35]
my_font = fm.FontProperties(fname='/System/Library/Fonts/PingFang.ttc',size=10)
plt.bar(index,TJ,width=0.3,label='天津')
plt.bar(index,BJ,width=0.3,bottom=TJ,color='green',label='北京')
plt.xticks(index,index)
plt.legend(prop=my_font,loc='upper right')
plt.show()

效果截图：