I need to move away from using inheritance in my Python. I’ve been using Rust exclusively for the past year and it’s definitely going to affect how I write code in other languages.
“If only I could make this a
trait
…”Yes!
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No. Duck types (including virtual subclasses) considered harmful; use real inheritance if your language doesn’t provide anything strictly better.
It is incomparably convenient to be able to retroactively add “default implementations” to interface functions (consider for example how broken
readinto
is in Python). Some statically-typed languages let you do that without inheritance, but no dynamically-typed language can.This reads more as a rant against inheritance (without any explanation whatsoever) than a legitimate argument.