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)
16
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17
Index

Using the OS environment settings

There are several ways to look at inputs provided by the users of our software:

  • Interactive input: This is provided by the user on demand, as they interact with the application or service.
  • Command-line arguments: These are provided once, when the program is started.
  • Environment variables: These are OS-level settings. There are several ways these can be set, as shown in the following list:
  • Environment variables can be set at the command line, when the application starts.
  • They can be configured for a user in a configuration file for the user's selected shell. For example, if using zsh, these files are the ~/.zshrc file and the ~/.profile file. There can also be system-wide files, like /etc/zshrc. This makes the values persistent and less interactive than the command line. Other shells offer other filenames for settings and configurations unique to the shell.
  • In Windows, there's the Advanced Settings...