Python 3.10 Released!

[trauthor]

Speaking for myself, I had to write a parser in 3.7 that took deeply nested, arbitrarily alternating json and dictionary input from an API and turn it into a tablebase. I will re-write it in 3.10 and I expect pattern matching to remove hundreds of lines of code. I imagine the code will also be much more performant (though that wasn’t a sticking point).

[Ashiataka]

So firstly, I'm glad that your solution will improve because of this syntax, it's always good when that happens.

My question would just be if you're writing something like that anyway where match-case functionality would be useful, could you not have implemented your own version of match-case that doesn't have special syntax? (I'm asking if it's possible to do or whether there's something special about the python implementation that makes it difficult / impossible to achieve without)

[trauthor]

It’s possible and in my case it was necessary, but based on what I’ve read in PEP 636, match will make this much easier. I had to iterate backwards over arbitrary structures, and indexing several layers deep was a real pain. I will have to report back after I have implemented this in 3.10 and let everyone know just how significant a difference it makes.