This article first appeared in the quantitative investment and Machine Learning
Reproduced in https://mp.weixin.qq.com/s/KaB_7oXZf0_IV97y0pRPmQ
Recently, this sort of dynamic video super fire bar, as shown below:
Specifically, this map can be called: Bar Chart Race, what is the country's GDP, a certain history of ups and downs and so on, in order to attribute identity number of the public, we created this simple visualization video for everyone: 2 015 ~ 2019 Chinese private equity market changes , first to see it now!
You can make more interesting to visualize data based private equity fund! Everyone is invited to also contribute oh!
Choose a day as collision, public No. taught you today!
We use the most popular Python language , based on Matplotlib to achieve dynamic effects above. Cases and data since 1500 the world's 10 largest cities ranked.
Ready to work
Import-related library:
Use pandas urban population read the relevant data set. We need only four data: 'name', 'group', 'year', 'value'. A name is mapped to a group, there is a value each year.
The original data set:
Data Conversion
Use pandas conversion, the first 10 values obtained.
Foundation drawing
Let's draw a basic histogram. First, create a graphic and a coordinate axis. Then ax.barh (x, y) draw a horizontal bar graph.
Colors, labels
Next, let's add value labels and color groups according to the group. Use colors and add color to group_lk bar.
group_lk is a mapping between a group name and a value.
Details of the characterization
For convenience, we will migrate the code to draw_barchart function:
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Text: update the font size, color, direction
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Axis: x-axis to the top, and add color subtitle
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Grid：在bars添加
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Format：逗号分隔值和轴标记符
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Remove：框架，y轴标签
动态化，激动人心！
要对上图进行动画处理，我们将使用 matplotlib.animation 中的 FuncAnimation。
Functionatio 通过反复调用函数（在画布上绘制）来创建动画。在本例中，该函数将是 draw_barchart。 我们使用 frames，这个参数接受你想运行的 draw_barchart 的值——我们将从1968年运行到2018年。
我们还可以通过下面的红框，调整速度、倒退等操作。
你可以将动画对象保存为视频或gif形式：
OK，大功告成！赶快一显身手吧！
整个代码不到40行！
获取代码
链接:https://pan.baidu.com/s/1O-f2tQFErHJ-APjopGGqBA(或点击阅读原文)
密码:c9ow