this post was submitted on 15 Sep 2023

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35

Type hinting in modern Python: The Protocol class (codebeez.nl)

submitted 1 year ago* (last edited 1 year ago) by nikaro@jlai.lu to c/python@programming.dev

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This is like Interface in Go (or Java, i don't speak Java but the article say so).

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[–] NostraDavid@programming.dev 1 points 1 year ago (4 children)

OK, but why would I use this over ABCs? (Abstract Base Class). Or is it just different?

[–] nikaro@jlai.lu 1 points 1 year ago (2 children)

From what i understand, Protocol is for custom interfaces that you define (this object must have do_x() method), while ABCs are generic (this object is iterable).

[–] twoframesperminute@mastodon.social 0 points 1 year ago* (last edited 1 year ago) (1 children)

@nikaro iterable means: has __iter__() method. So there's no real difference, as far as I can see.

[–] nikaro@jlai.lu 1 points 1 year ago

The difference is that with Protocol you can define which method presence you want to ensure. Like i said: custom vs. generic.

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