Book Image

Modular Programming with Python

By : Erik Westra
Book Image

Modular Programming with Python

By: Erik Westra

Overview of this book

Python has evolved over the years and has become the primary choice of developers in various fields. The purpose of this book is to help readers develop readable, reliable, and maintainable programs in Python. Starting with an introduction to the concept of modules and packages, this book shows how you can use these building blocks to organize a complex program into logical parts and make sure those parts are working correctly together. Using clearly written, real-world examples, this book demonstrates how you can use modular techniques to build better programs. A number of common modular programming patterns are covered, including divide-and-conquer, abstraction, encapsulation, wrappers and extensibility. You will also learn how to test your modules and packages, how to prepare your code for sharing with other people, and how to publish your modules and packages on GitHub and the Python Package Index so that other people can use them. Finally, you will learn how to use modular design techniques to be a more effective programmer.
Table of Contents (16 chapters)
Modular Programming with Python
About the Author
About the Reviewer


Abstraction is another very general programming pattern that applies to more than just modular programming. Abstraction is essentially the process of hiding complexity: separating what you want to do from how to do it.

Abstraction is absolutely fundamental to all computer programming. Imagine, for example, that you had to write a program that calculates two averages and then figures out the difference between the two. A simplistic implementation of this program might look something like the following:

values_1 = [...]
values_2 = [...]

total_1 = 0
for value in values_1:
    total = total + value
average_1 = total / len(values_1)

total_2 = 0
for value in values_2:
    total = total + value
average_2 = total / len(values_2)

difference = abs(total_1 - total-2)

As you can see, the code that calculates the average of a list of numbers is repeated twice. This is inefficient, so you would normally write a function to avoid repeating yourself. This can be done in the...