Python 编程: 用Pandas绘制多柱状图 Use Pandas to plot multiple bar chart in Python
用DataFrame建立二维数据，直接调用DataFrame的bar()绘制多柱状图
用bar()返回的Axes对象调用Figure的savefig()把统计图输出到图形文件
Use Pandas' DataFrame to create a 2-dimensional (2D) dataset
Call DataFrame's bar() method to plot the multiple bar chart
By accessing the Axes object returned by the bar() function, we can
save the plotting as an image file.
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