Protocols and Composition in Python

• typer

  86 14,293 6.7 Python

  Typer, build great CLIs. Easy to code. Based on Python type hints.

As means of demonstrating this last property, let's create a simple CLI tool for adding numbers - we'll add logging debug messages and timing reports as optional features that can be enabled using flags. I'm going to use typer to turn our service into a CLI application:

• go-kit

  32 26,088 3.8 Go

  A standard library for microservices.

  

I first learned of this pattern in Go's go-kit where I've seen it called "service middlewares". The Design Patterns book describes something similar as the "decorator" pattern - not to be confused with Python decorators, which have the unfortunate property of melding themselves with what they decorate, which limits their practical usefulness, at least as far as reducing coupling is concerned.

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• composition_using_protocols

  1 1 0.0 Python

  Example code for a blog post about composition patterns in Python.

A working example of the protocol-based implementation can be found on GitHub.

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