Mastering Python Design Patterns - Second Edition

Use cases

If you realize that you cannot track the objects created by your application because the code that creates them is in many different places instead of in a single function/method, you should consider using the factory method pattern. The factory method centralizes object creation and tracking your objects becomes much easier. Note that it is absolutely fine to create more than one factory method, and this is how it is typically done in practice. Each factory method logically groups the creation of objects that have similarities. For example, one factory method might be responsible for connecting you to different databases (MySQL, SQLite), another factory method might be responsible for creating the geometrical object that you request ...