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
Other Books You May Enjoy
17
Index

Leveraging exception matching rules

The try statement lets us capture an exception. When an exception is raised, we have a number of choices for handling it:

  • Ignore it: If we do nothing, the program stops. We can do this in two ways—don't use a try statement in the first place, or don't have a matching except clause in the try statement.
  • Log it: We can write a message and use a raise statement to let the exception propagate after writing to a log; generally, this will stop the program.
  • Recover from it: We can write an except clause to do some recovery action to undo any effects of the partially completed try clause.
  • Silence it: If we do nothing (that is, use the pass statement), then processing is resumed after the try statement. This silences the exception.
  • Rewrite it: We can raise a different exception. The original exception becomes a context for the newly raised exception.

What about nested contexts? In this case...