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

Building complex strings with f-strings

Creating complex strings is, in many ways, the polar opposite of parsing a complex string. We generally find that we use a template with substitution rules to put data into a more complex format.

Getting ready

Let's say we have pieces of data that we need to turn into a nicely formatted message. We might have data that includes the following:

>>> id = "IAD"
>>> location = "Dulles Intl Airport"
>>> max_temp = 32
>>> min_temp = 13
>>> precipitation = 0.4

And we'd like a line that looks like this:

IAD : Dulles Intl Airport : 32 / 13 / 0.40

How to do it...

  1. Create an f-string from the result, replacing all of the data items with {} placeholders. Inside each placeholder, put a variable name (or an expression.) Note that the string uses the prefix of f'. The f prefix creates a sophisticated string object where values are interpolated...