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This is like Interface in Go (or Java, i don’t speak Java but the article say so).
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).
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.
OK, but why would I use this over ABCs? (Abstract Base Class). Or is it just different?
From what i understand,
Protocolis for custom interfaces that you define (this object must havedo_x()method), while ABCs are generic (this object is iterable).@nikaro iterable means: has __iter__() method. So there’s no real difference, as far as I can see.
The difference is that with
Protocolyou can define which method presence you want to ensure. Like i said: custom vs. generic.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.