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rednafi

I've been meaning to publish this one for a while. It talks about an insidious type of inheritance that has somehow become the defacto design tool in the realm, is easy to spot but quite difficult to fix, and hurts readability as your code grows.

rednafi.com/python/escape_temp

Redowan's Reflections · Escaping the template pattern hellscape in PythonOver the years, I’ve used the template pattern1 across multiple OO languages with varying degrees of success. It was one of the first patterns I learned in the primordial hours of my software engineering career, and for some reason, it just feels like the natural way to tackle many real-world code-sharing problems. Yet, even before I jumped on board with the composition over inheritance2 camp, I couldn’t help but notice how using this particular inheritance technique spawns all sorts of design and maintenance headaches as the codebase starts to grow.
Jul 02, 2023, 02:05 PM·Public·Mastodon for iOS
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b-long

@rednafi Thanks for sharing this article! It reminded me of an earlier one you wrote that I really enjoyed ( rednafi.com/python/use_init_su ), especially since it avoids meta classes.

On the function design / composition topic, this one is another favorite: danuker.go.ro/the-grand-unifie

Redowan's ReflectionsUse '__init_subclass__' hook to validate subclasses in PythonAt my workplace, we have a fairly large Celery config file where you’re expected to subclass from a base class and extend that if there’s a new domain. However, the subclass expects the configuration in a specific schema. So, having a way to enforce that schema in the subclasses and raising appropriate runtime exceptions is nice. Wrote a fancy Python 3.6+ __init_subclasshook__ to validate the subclasses as below. This is neater than writing a metaclass.
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rednafi

@blong Yeah. Once you add a metaclass, all of your subsequent subclasses will get infected with the encumbrance of its internals that they probably don't care about. Thanks for reading 😀

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