如何绘制熊猫数据框?
问题描述：
您好，我是 Python 新手，正在尝试绘制数据框.
Hi am new to python and trying to plot a dataframe.
subject name marks
0 maths ankush 313
1 maths anvesh 474
2 maths amruth 264
3 science ankush 81
4 socail ankush 4
5 maths anirudh 16470
6 science anvesh 568
7 socail anvesh 5
8 science amruth 15
希望绘制条形图，如图所示.
am looking to plot the bar graph something like as shown in the figure.
感谢您的帮助.
答
问题有两个方面.
- 数据需要采用什么格式才能生成条形图?
- 如何将数据转换为该格式?
对于所需的图表，您需要数据框索引的x轴名称以及作为列的主题.
For the chart you want, you need the names in the x-axis in the index of the dataframe and the subjects as columns.
这需要一个支点
df.set_index(['name', 'subject']).marks.unstack(fill_value=0)
subject maths science socail
name
amruth 264 15 0
anirudh 1647 0 0
ankush 313 81 4
anvesh 474 568 5
以及随后的情节
df.set_index(['name', 'subject']).marks.unstack(fill_value=0).plot.bar()