Polars-Cookbook

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Polars-Cookbook

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Polars Cookbook, Published by Packt

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# Polars-Cookbook
<a href="https://www.packtpub.com/en-us/product/polars-cookbook-9781805121152"><img src="https://content.packt.com/_/image/xxlarge/B21621/cover_image_large.jpg" height="256px" align="right"></a>

B21621 - Polars Cookbook - [Available as an ebook and a physical copy on Amazon](https://www.amazon.com/Polars-Cookbook-practical-transform-manipulate/dp/1805121154)

## [Chapter 1: Getting Started with Python Polars](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter01/ch01.ipynb)
- Introducing Key Features in Polars 
- The Polars DataFrame 
- The Polars Series 
- The Polars LazyFrame 
- Selecting columns and filtering data 
- Creating, modifying, and deleting columns 
- Understanding method chaining 
- Processing datasets larger than RAM

## [Chapter 2: Reading and Writing Files](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter02/ch02.ipynb)
- Reading and writing CSV files 
- Reading and writing parquet files 
- Reading and writing delta tables 
- Reading and writing JSON files 
- Reading and writing excel files 
- Reading and writing other data file formats 
- Reading and writing multiple files 
- Working with databases

## [Chapter 3: An Introduction to Data Analysis in Python Polars](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter03/ch03.ipynb)
- Inspecting the DataFrame 
- Casting data types 
- Handling duplicate values 
- Masking sensitive data 
- Visualizing data using Plotly 
- Detecting and handling outliers

## [Chapter 4: Data Transformation Techniques](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter04/ch04.ipynb)
- Exploring basic aggregations
- Using group by aggregations
- Aggregating values across multiple columns
- Computing with window functions
- Applying UDFs
- Using SQL for data transformations

## [Chapter 5: Handling Missing Data](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter05/ch05.ipynb)
- Identifying missing data 
- Deleting rows and columns containing missing data 
- Filling missing data

## [Chapter 6: Performing String Manipulations](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter06/ch06.ipynb)
- Filtering strings 
- Converting strings into a Date/Datetime/Time 
- Extracting substrings 
- Cleaning strings 
- Splitting strings into lists and structs 
- Concatenating and combining strings

## [Chapter 7: Working with Nested Data Structures](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter07/ch07.ipynb)
- Creating lists 
- Aggregating elements in lists 
- Accessing and selecting elements in lists 
- Applying logic to each element in lists 
- Working with structs and JSON data

## [Chapter 8: Reshaping and Tidying Data](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter08/ch08.ipynb)
- Turning columns into rows 
- Turning rows into columns  
- Joining DataFrames 
- Concatenating DataFrames 
- Other reshaping techniques

## [Chapter 9: Time Series Analysis](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter09/ch09.ipynb)
- Working with date and time 
- Applying rolling windows calculations 
- Resampling techniques 
- Time series forecasting with the functime library

## [Chapter 10: Interoperability With Other Python Libraries](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter10/ch10.ipynb)
- Converting to and from a pandas DataFrame 
- Converting to and from NumPy arrays
- Interoperating with PyArrow 
- Integration with DuckDB

## [Chapter 11: Working With Common Cloud Sources](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter11/ch11.ipynb)
- Amazon S3 
- Azure Blog Storage 
- Google Cloud Storage 
- BigQuery 
- Snowflake

## [Chapter 12: Testing and Debugging in Polars](https://github.com/PacktPublishing/Polars-Cookbook/blob/main/Chapter12/ch12.ipynb)
- Debugging chained operations 
- Inspecting and optimizing the query plan 
- Testing data quality with cuallee 
- Running unit tests with Pytest

## Errata
* Page 06 (code block 1): **Import polars as pl** _should be_ **import polars as pl**
* Page 23 (code block 2, line 2): **df.select(cs.numeric()).head()** _should be_ **df.select(cs.string()).head()**
  
## New Outstanding Features and Breaking Changes NOT Captured in the Book
- Version 1.6.0
  - Use Altair in DataFrame.plot ([#17995](https://github.com/pola-rs/polars/pull/17995)).

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