Python Altair – Scatter Plot

In this article, we will learn a Simple Scatter plot with Altair using python. Altair is one of the latest interactive data visualizations library in python. Altair is based on vega and vegalite– A grammar of interactive graphics.  Here we will import the Altair library for using it. And then we will load the Seattle weather data from vega_dataset.

Step-by-step Approach: 

• Import modules.

Python3

# import required modules
import altair as alt
from vega_datasets import data

• Assign dataset and convert it into a data frame.

Python3

# assign dataset
seattle_weather = data.seattle_weather()

• Display dataset.

Python3

# display dataset
seattle_weather.head(5)

Output:

• Now let us make the scatter plot using Altair library. For this, we use Chart() function in Altair to load the data and then use the mark_point() function to make a scatter plot. We then use the aesthetics x and y-axis to encode() function. Hence, we get the simple scatter plot of two variable as shown below:

Python3

# depict scatter plot
alt.Chart(seattle_weather).mark_point().encode(
    x='temp_max',
    y='temp_min'
)

Output:

Below is the complete program based on the above approach:

Python3

# import required modules
import altair as alt
from vega_datasets import data


# assign dataset
seattle_weather = data.seattle_weather()

# display dataset
seattle_weather.head(5)

# depict scatter plot
alt.Chart(seattle_weather).mark_point().encode(
    x='temp_max',
    y='temp_min'
)

Output: