Book Image

Modern Python Cookbook - Second Edition

By : Steven F. Lott
Book Image

Modern Python Cookbook - Second Edition

By: Steven F. Lott

Overview of this book

Python is the preferred choice of developers, engineers, data scientists, and hobbyists everywhere. It is a great language that can power your applications and provide great speed, safety, and scalability. It can be used for simple scripting or sophisticated web applications. By exposing Python as a series of simple recipes, this book gives you insight into specific language features in a particular context. Having a tangible context helps make the language or a given standard library feature easier to understand. This book comes with 133 recipes on the latest version of Python 3.8. The recipes will benefit everyone, from beginners just starting out with Python to experts. You'll not only learn Python programming concepts but also how to build complex applications. The recipes will touch upon all necessary Python concepts related to data structures, object oriented programming, functional programming, and statistical programming. You will get acquainted with the nuances of Python syntax and how to effectively take advantage of it. By the end of this Python book, you will be equipped with knowledge of testing, web services, configuration, and application integration tips and tricks. You will be armed with the knowledge of how to create applications with flexible logging, powerful configuration, command-line options, automated unit tests, and good documentation.
Table of Contents (18 chapters)
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Finding configuration files

Many applications will have a hierarchy of configuration options. The foundation of the hierarchy is often the default values built into a particular release. These might be supplemented by server-wide (or cluster-wide) values from centralized configuration files. There might be user-specific files, or perhaps even configuration files provided when starting a program.

In many cases, configuration parameters are written in text files, so they are persistent and easy to change. The common tradition in Linux is to put system-wide configuration in the /etc directory. A user's personal changes would be in their home directory, often named ~username or $HOME.

In this recipe, we'll see how an application can support a rich hierarchy of locations for configuration files.

Getting ready

The example we'll use is a web service that provides hands of cards to users. The service is shown in several recipes throughout Chapter 12, Web Services...