26 Apr
2018
26 Apr
'18
8:54 p.m.
On 4/26/2018 6:20 AM, Steve Holden wrote:
On Thu, Apr 26, 2018 at 8:56 AM, Steven D'Aprano <steve@pearwood.info
mailto:steve@pearwood.info> wrote:
On Thu, Apr 26, 2018 at 03:31:13AM -0400, Terry Reedy wrote:
> On 4/25/2018 8:20 PM, Chris Angelico wrote:
> >On Thu, Apr 26, 2018 at 10:11 AM, Yury Selivanov
> ><yselivanov.ml@gmail.com <mailto:yselivanov.ml@gmail.com>> wrote:
> >>Just yesterday this snippet was used on python-dev to show how great the
> >>new syntax is:
> >>
> >> my_func(arg, buffer=(buf := [None]*get_size()), size=len(buf))
>
> What strikes me as awful about this example is that len(buf) is
> get_size(), so the wrong value is being named and saved.
> 'size=len(buf)' is, in a sense, backwards.
Terry is absolutely right, and I'm to blame for that atrocity. Mea
culpa.
Perhaps a better spelling would be
my_func(arg, buffer=[None]*(buflen := get_size()), size=buflen)
That is exactly what I wrote in the continuation that Steven snipped.
-- Terry Jan Reedy