How can Pygal be used to visualize a treemap in Python?

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Visualizing data is an important step since it helps understand what is going on in the data without actually looking at the complicated working underneath it and performing complicated computations.

Pygal is an open source Python package that helps in the creation of interactive plots, and SVG (Scalar Vector Graphics) images of graphs. SVG refers to dynamically generating animated graphs with the given data. These SVG images of graphs can be used and customized depending on our requirements. The SVG images are highly scalable, hence they can be downloaded in high quality format. These downloaded images can also be embedded to various projects, websites and so on.

These interactive and customized graphs can be created with ease in Pygal. Pygal helps create bar chart, histogram, line plot, and much more.

Treemap is used to represent that kind of data which is nested in nature. It is represented as a rectangle. The size of the map represents the values present in the dataset. Greater the size of the treemap indicates higher the value of the data point.

Pygal package can be installed using the below command on Windows −

pip install Pygal

Let us understand how Treemap be created using Pygal −


import pygal
from import Style
custom_style = Style(colors=('#E80080', '#404040', '#9BC850', '#E81190'))

treemap = pygal.Treemap(height=400,width = 300,style=custom_style)
treemap.title = "Treemap "
treemap.add("label 1", [0.4,0.5,0.6, 0.7])
treemap.add("label 2", [1.2,1.3,1.4])
treemap.add("label 3", [1.5,1.6,1.9])
treemap.add("label 3", [1.8,1.9,2.0,2.1,2.2])




  • The required packages are imported into the environment.

  • The pygal.Treemap function is called with a few parameters.

  • This is assigned to a variable that is used to add characteristics.

  • The colors for the Treemap are defined.

  • The height and width of the graph is also defined.

  • The title and values for the Treemap are defined.

  • The ‘render_in_browser’ function is called to plot the generated Treemap in the browser.

Updated on 19-Jan-2021 13:12:56