Book Image

Expert Python Programming – Fourth Edition - Fourth Edition

By : Michał Jaworski, Tarek Ziadé
5 (1)
Book Image

Expert Python Programming – Fourth Edition - Fourth Edition

5 (1)
By: Michał Jaworski, Tarek Ziadé

Overview of this book

This new edition of Expert Python Programming provides you with a thorough understanding of the process of building and maintaining Python apps. Complete with best practices, useful tools, and standards implemented by professional Python developers, this fourth edition has been extensively updated. Throughout this book, you’ll get acquainted with the latest Python improvements, syntax elements, and interesting tools to boost your development efficiency. The initial few chapters will allow experienced programmers coming from different languages to transition to the Python ecosystem. You will explore common software design patterns and various programming methodologies, such as event-driven programming, concurrency, and metaprogramming. You will also go through complex code examples and try to solve meaningful problems by bridging Python with C and C++, writing extensions that benefit from the strengths of multiple languages. Finally, you will understand the complete lifetime of any application after it goes live, including packaging and testing automation. By the end of this book, you will have gained actionable Python programming insights that will help you effectively solve challenging problems.
Table of Contents (16 chapters)
14
Other Books You May Enjoy
15
Index

Isolating the runtime environment

When you use pip to install a new package from PyPI, it will be installed into one of the available site-packages directories. The exact location of site-packages directories is specific to the operating system. You can inspect paths where Python will be searching for modules and packages by using the site module as a command as follows:

$ python3 -m site

The following is an example output of running python3 -m site on macOS:

sys.path = [
    '/Users/swistakm',
    '/Library/Frameworks/Python.framework/Versions/3.9/lib/python39.zip',
    '/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9',
    '/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/lib-dynload',
    '/Users/swistakm/Library/Python/3.9/lib/python/site-packages',
    '/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages',
]
USER_BASE: '/Users/swistakm/Library...