On Sat, Dec 4, 2021 at 11:25 PM Chris Angelico <[email protected]> wrote:
> > def add(a, b):
> > return a+b
> > How could you write that differently with your PEP
>
> I wouldn't. There are no default arguments, and nothing needs to be
> changed.
>
I do recognize that I *could* call that with named arguments. I also
recognize that the long post I wrote in the bath from my tablet is rife
with embarrassing typos :-).
Technically, I'd need `def add(a, b, /)` to be positional-only. But in
practice, almost everyone who writes or calls a function like that passes
by position. I'm not sure that I've *ever* actually used the explicit
positional-only `/` other than to try it out. If I have, it was rare
enough that I had to look it up then, as I did just now.
Actually PEP 671 applies identically to arguments passed by name or
> position, and identically to keyword-only, positional-or-keyword, and
> positional-only parameters.
>
> >>> def f(a=>[], /, b=>{}, *, c=>len(a)+len(b)):
> ... print(a, b, c)
>
Wow! That's an even bigger teaching nightmare than I envisioned in my
prior post. Nine (3x3) different kinds of parameters is already too big of
a cognitive burden. Doubling that to 18 kinds makes me shudder. I admit I
sort of blocked out the positional-only defaults thing.
I understand that it's needed to emulate some of the builtin or standard
library functions, but I would avoid allowing that in code review...
specifically because of the burden on future readers of the code.
--
Keeping medicines from the bloodstreams of the sick; food
from the bellies of the hungry; books from the hands of the
uneducated; technology from the underdeveloped; and putting
advocates of freedom in prisons. Intellectual property is
to the 21st century what the slave trade was to the 16th.
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