[dragonwriter]

For concurrency I think Raku has slightly more developed async support than Python, but the bigger advantage, I think, is in parallelism where, aside from the CPython GIL limiting practical parallelism in the main implementation (which is a big deal), Python as a language lacks the parallel iterables produced by the hyper (parallel but constrained to return in order) and race (parallel and not constrained in order) methods on the Iterable role in Raku, or anything like Raku’s hyperoperators that are semantically concurrent and parallelizable at the discretion of the optimizer. (Come to think of it, while also parallel, all those are also high-level concurrency constructs that Python lacks equivalents to.)

Python as a language can support parallelism via threads, and CPython as an implementation can via multiprocessing, but those are both very low level abstractions; Raku has higher level abstractions which allow much more succinct expression of parallel operations.

[Too]

Sounds like multiprocessing.Pool.imap and imap_unordered? When dealing with io you also have async/await equivalent iterators like asyncio.as_completed().

[b2gills]

Raku has `await` but it doesn't need `async`.

    sub foo ( Int \n where 1..100 ) {
      #  ___ start is a prefix operator that creates a Promise
      # V
      start { sleep n.rand; (1..n).pick }
    }

    my $result = foo(10);

    say $result.status; # Planned

    say await $result; # 6 (after a delay)



    # this is nearly identical to foo above
    sub bar ( Int \n where 1..100 ) {
      Promise.in( n.rand ).then({ (1..n).pick })
    }

(Note that `start` does not need a block unless you are grouping more than one statement as I have above.)

There are combinators like `Promise.allof` and `Promise.anyof`.

You usually don't need to use `Promise.allof`, because you can use `await` on a list.

    my @promises = Promise.in(1.rand) xx 10;

    my @results = await @promises;

(Note that the left side of `xx` is _thunky_ so there are ten different Promises with ten different random wait times.)

---

You should see the `react`/`supply` and `whenever` feature.