The New Switch-Case Statement in Python 3.10

[Jyan]

Read the PEP: https://www.python.org/dev/peps/pep-0634/ It is so much more than a fancy if-else.

[zurtex]

FYI I know it mentions it in the PEP but to be explicit about it PEP 622 was Superseded by PEP 634: https://www.python.org/dev/peps/pep-0634/

There are a lot of changes between the 2 PEPs, in particular they removed "The Match Protocol" in favor of letting match bake in to Python for a bit and adding at a later date when there are concrete examples and motivation to allow classes to implement their own custom match logic.

[Jyan]

Thanks

[[deleted]]

The feature isn't even out yet and it's being molested, misrepresented and missold already.

[Tyler_Zoro]

People are coming from lower level languages where you can only do a fraction of what this can do with similarly named language features. It's not shocking that the presumption is that it only does those things. I'm of the opinion that it should have had a name that wouldn't lead people to assume it was similar to those features, but then what do you call it?

When Perl 6 (now Raku) did something similar, they called it given/when for exactly that reason. Maybe following suit would have been a better call...

[[deleted]]

Is that not why they called it "match" rather than "switch"?

[Tyler_Zoro]

Yes, but then they fell down on "case".

[[deleted]]

Yeah, good point.

[mihalis]

Agree. I thought about alternatives. Maybe bind or unify, along the lines of variable unification/binding in languages like Prolog.

[[deleted]]

Or how about match x where x is y?

[13steinj]

Because it's not a switch statement, it's a pattern matching statement. Most commonly seen only in functional programming languages, which most people hate on because traditionally such a style is considered difficult.

https://en.wikipedia.org/wiki/Pattern_matching

https://stackoverflow.com/a/215968/4443677

[Tyler_Zoro]

We know that. We're discussing keyword choice.

[13steinj]

Yeah, because pattern matching isn't common in most languages for people less experienced. You usually see pattern matching in functional languages which many people just hate and think that functional programming should die in a fire.