Book Image

Modern Python Standard Library Cookbook

By : Alessandro Molina
Book Image

Modern Python Standard Library Cookbook

By: Alessandro Molina

Overview of this book

The Python 3 Standard Library is a vast array of modules that you can use for developing various kinds of applications. It contains an exhaustive list of libraries, and this book will help you choose the best one to address specific programming problems in Python. The Modern Python Standard Library Cookbook begins with recipes on containers and data structures and guides you in performing effective text management in Python. You will find Python recipes for command-line operations, networking, filesystems and directories, and concurrent execution. You will learn about Python security essentials in Python and get to grips with various development tools for debugging, benchmarking, inspection, error reporting, and tracing. The book includes recipes to help you create graphical user interfaces for your application. You will learn to work with multimedia components and perform mathematical operations on date and time. The recipes will also show you how to deploy different searching and sorting algorithms on your data. By the end of the book, you will have acquired the skills needed to write clean code in Python and develop applications that meet your needs.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Splitting strings and preserving spaces


Usually when splitting strings on spaces, developers will tend to rely on str.split, which is able to serve that purpose pretty well. But when the need to split some spaces and preserve others arises, things quickly become harder and implementing a custom solution can require investing time in proper escaping.

How to do it...

Just rely on shlex.split instead of str.split:

>>> importshlex>>>>>> text='I was sleeping at the "Windsdale Hotel"'>>> print(shlex.split(text))['I', 'was', 'sleeping', 'at', 'the', 'Windsdale Hotel']

How it works...

shlex is a module originally created to parse Unix shell code. For that reason, it supports preserving phrases through quotes. Typically, in Unix command lines, words separated by spaces are provided as arguments to the called command, but if you want to provide multiple words as a single argument, you can use quotes to group them.

That's exactly what shlex reproduces, providing us with...