Practices of the Python Pro

Chapter 7. Extensibility and flexibility

This chapter covers

• Using inversion of control to make code flexible
• Using interfaces to make code extensible
• Adding new features to your existing code

At many established organizations, your day-to-day work as a developer involves not only writing new applications, but updating existing ones. When you’re tasked with adding a new feature to an existing application, your goal is to extend the functionality of that application, introducing new behavior by adding code.

Some applications are flexible to this kind of change and can adapt to shifting requirements. Others may fight you tooth and nail. In this chapter, you’ll learn strategies for writing software that’s flexible and extensible by adding an ...