this post was submitted on 15 Sep 2023

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

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/python

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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 1 points 1 year ago (2 children)

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

[–] [email protected] 4 points 1 year ago

Protocols are static duck typing. An object is a valid instance of protocol if it implements all the methods defined in the protocol, even if it doesn't declare it as implementing it. That last bit is important and the most distinguishing factor compared to an ABC.

[–] [email protected] 1 points 1 year ago (1 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).

[–] [email protected] 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.

[–] [email protected] 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.