The Quick Python Book, Third Edition

Chapter 18. Packages

This chapter covers

• Defining a package
• Creating a simple package
• Exploring a concrete example
• Using the __all__ attribute
• Using packages properly

Modules make reusing small chunks of code easy. The problem comes when the project grows and the code you want to reload outgrows, either physically or logically, what would fit into a single file. If having one giant module file is an unsatisfactory solution, having a host of little unconnected modules isn’t much better. The answer to this problem is to combine related modules into a package.

18.1. What is a package?

A module is a file containing code. A module defines a group of usually related Python functions or other objects. The name of the module is derived from the ...