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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

6 comments fedilink hide all child comments

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

top 6 comments

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[–] AlgoMammoth@programming.dev 6 points 1 year ago

Oh nice, I did not know about the Protocol class. It seems handy when I have to deal with untyped 3rd party modules.

[–] NostraDavid@programming.dev 1 points 1 year ago (2 children)

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

[–] bamboo@lemm.ee 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.

[–] nikaro@jlai.lu 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).

[–] 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.