Book Image

Mastering Python 2E - Second Edition

By : Rick van Hattem
5 (1)
Book Image

Mastering Python 2E - Second Edition

5 (1)
By: Rick van Hattem

Overview of this book

Even if you find writing Python code easy, writing code that is efficient, maintainable, and reusable is not so straightforward. Many of Python’s capabilities are underutilized even by more experienced programmers. Mastering Python, Second Edition, is an authoritative guide to understanding advanced Python programming so you can write the highest quality code. This new edition has been extensively revised and updated with exercises, four new chapters and updates up to Python 3.10. Revisit important basics, including Pythonic style and syntax and functional programming. Avoid common mistakes made by programmers of all experience levels. Make smart decisions about the best testing and debugging tools to use, optimize your code’s performance across multiple machines and Python versions, and deploy often-forgotten Python features to your advantage. Get fully up to speed with asyncio and stretch the language even further by accessing C functions with simple Python calls. Finally, turn your new-and-improved code into packages and share them with the wider Python community. If you are a Python programmer wanting to improve your code quality and readability, this Python book will make you confident in writing high-quality scripts and taking on bigger challenges
Table of Contents (21 chapters)
19
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20
Index

Testing multiple environments with tox

Now that we have written our tests and are able to run them for our own environment, it’s time to make sure that others can easily run the tests too. tox can create sandboxed environments for all specified Python versions (assuming they are installed) and runs them automatically and in parallel if needed. This is especially useful to test if your dependency specification is up to date. While you may have a lot of packages installed in your local environment, someone else might not have those packages.

Getting started with tox

Before we can do anything, we need to install the tox command. A simple pip install will suffice:

$ pip3 install --upgrade tox

After the install, we can start by creating a tox.ini file to specify what we want to run. The easiest way is by using tox-quickstart, but if you already have a functioning tox.ini from a different project you can easily copy and modify that:

$ tox-quickstart
Welcome to...