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polars-book's Introduction

Polars Documentation

This repo contains the User Guide for the Polars DataFrame library.

Getting Started

To build the benchmarks and Python code examples, Graphviz, make, wget as well as the Python packages listed in requirements.txt need to be present on the system.

To build the User Guide, the Rust-based mdBook executable should also be downloaded/compiled and accessible (in the PATH).

To build the Reference Guide, a custom mdBook executable should also be downloaded from here and made accessible as mdbook2 in the PATH.

Using the Makefile

The reference guide requires a specific Python version to be used. Make sure to check __main__.SRC for reference guide work.

Use make serve to serve the user guide.

User Guide

Status of the code snippets

Example Rust Python JavaScript
CSV files
Parquet files
Interact with an AWS bucket
Interact with an Azure Blob Storage
Interact with a GCP Storage
Interact with a database
Process strings
Process timestamps
Process missing values
Process nested values (explode)
Rename columns and other manipulations*
Column/row selection*
Filter*
GroupBy*
Join
Sort*
Pivot/melt
Aggregate*
Conditionally apply*
Horizontal fold
Stacking
Sampling
Arrow interoperability
NumPy interoperability
Apply NumPy universal functions*
Apply custom functions (UDFs)
Apply window functions*
Apply rolling-window functions
Group statistics

* Some How Can I code examples not included but topic introduced elsewhere.

Reference Guides

At this point in time, only Python and NodeJS bindings are available for Polars.

The content of the Reference Guides is generated directly from the source code. In this repo one can find the scripts used to generate the Markdown content later rendered by mdBook (a custom version thereof).

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