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

Writing hints for more complex types

The Python language allows us to write functions (and classes) that are entirely generic with respect to data type. Consider this function as an example:

    def temperature(*, f_temp=None, c_temp=None):
        if c_temp is None:
            return {'f_temp': f_temp, 'c_temp': 5*(f_temp-32)/9}
        elif f_temp is None:
            return {'f_temp': 32+9*c_temp/5, 'c_temp': c_temp}
        else:
            raise TypeError("One of f_temp or c_temp must be provided")

This follows three recipes shown earlier: Using super flexible keyword parameters, Forcing keyword-only arguments with the * separator, and Designing complex if...elif chains, from Chapter 2, Statements and Syntax.

This function produces a fairly complex data structure as a result. It's not very clear what the data structure is. Worse, it's difficult to be sure functions are using the output from this function...