Technical requirements

You can download the dataset and code from the GitHub repository:

• Dataset: https://github.com/PacktPublishing/Polars-Cookbook/tree/main/data
• Code: https://github.com/PacktPublishing/Polars-Cookbook/tree/main/Chapter08

It is assumed that you have installed the Polars library in your Python environment:

>>> pip install polars

And that you imported it in your code:

import polars as pl

We’ll be using the international student demographic dataset in this chapter. There are a few CSV files in the dataset we’ll be using, but academic.csv will be used throughout the chapter. Read it into a DataFrame with the following code:

df = pl.read_csv('../data/academic.csv')

Clean the data by renaming a column, casting data types, and keeping only the recent years of data:

from polars import selectors as cs
df = (
    df
    .select(
      ...