On Sun, May 24, 2020, 3:43 PM Guido van Rossum <gu...@python.org> wrote:

> I’ve never been able to remember whether (f@g)(x) means f(g(x)) or
> g(f(x)). That pretty much kills the idea for me.
>

Well, it means whichever one the designers decide it should mean. But
obviously it's a thing to remember, and one that could sensibly go the
other way.

On the other hand, when I showed an example using filter() a couple days
ago, I had to try it to remember whether the predicate or the iterable came
first. Lots of such decisions are pretty arbitrary.
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