Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “pl.read_csv() is one of the common ways to read data into a DataFrame.”

A block of code is set as follows:

import numpy as np
numpy_arr = np.array([[1,1,1], [2,2,2]])
df = pl.from_numpy(numpy_arr, schema={'ones': pl.Float32, 'twos': pl.Int8}, orient='col')
df.head()

Any command-line input or output is written as follows:

$ pip install polars

Tips or important notes

Appear like this.