On Sun, May 24, 2020 at 4:55 PM David Mertz <me...@gnosis.cx> wrote: > Changed subject line. This is far from original topic. > > On Sun, May 24, 2020, 9:35 AM Ram Rachum <r...@rachum.com> wrote: > >> What's wrong with using @? If I understand correctly, it's used for >> matrix multiplication, which is far enough from function composition to >> avoid confusion. And it's slightly similar visually to a circle. >> > > I like @. Function composition is kinda-sorta enough like for product that > I can even make sense of the same operator. > > But how would you go about getting a .__matmul__ attribute onto all > functions. >
That's easy, especially when everyone is talking about evil. ``` from forbiddenfruit import curse def compose(self, other): return lambda *args, **kwargs: self(other (*args, **kwargs)) for func in [compose, len]: curse(type(func), "__matmul__", compose) assert (len @ str)(789) == 3 ``` https://repl.it/@alexmojaki/LeanEnergeticPublisher#main.py But seriously, I don't see that much point to this idea. It's just slightly more concise while not being particularly readable or beginner friendly. ``` sorted(paths, key=len @ str) sorted(paths, key=lambda p: len(str(p))) ``` I think the problem is just that lambda isn't the nicest syntax, and we'd like something more concise, e.g. ``` sorted(paths, key=:len(str($))) ``` which would be more generally useful. But I know this kind of thing has been discussed to death.
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