How To Make Bubble plot with Altair in Python? Bubble plot is simply a scatter plot where we plot bubbles/circles instead of points in a scatter plot. Bubble chart is useful when you have three variables and the size of the bubbles show the third variable. In this tutorial, we will learn how to make bubble plot using Altair in Python. Let us load Altair and Pandas. 1. 2. import altair as alt.