Patterns

Code-level design patterns: reusable solutions for structuring and constructing objects within a service, as distinct from the broader architectural styles in the parent Architecture section (how a whole system is organized, how services communicate). The architectural goal these two patterns exist to satisfy — Dependency Inversion — lives one level up, in Architecture itself, rather than here.

Articles

• Dependency Injection with Protocols — structural typing with typing.Protocol instead of ABC inheritance, and why that avoids hierarchy hell.
• Factory Pattern in Python — from a plain function to registries to @classmethod alternative constructors.

Contributing

Picked up a design pattern worth documenting — GoF-style or a Pythonic take on one? Add it here as its own file. See Contributing for the how-to.