[Python-ideas] Inline assignments using "given" clauses

[Neil Girdhar]

Another benefit of given compared with := that I just thought of is this.
Suppose you have a generator like

(expression(f(x), y, z)
 for x in xs
 for y in ys(x)
 for z in zs(y))

With given notation you can optimize:

(expression(f_x, y, z)
 for x in xs
 given f_x = f(x)
 for y in ys(x)
 for z in zs(y))

whereas with :=, you can't.

Best,

Neil

On Sat, May 12, 2018 at 10:56 PM David Mertz <mertz at gnosis.cx> wrote:

> Are votes cast in Edwin Hewitt's Hyperreals? I had thought python-ideas
> voted in the domain R rather than *R. :-)
>
> On Sat, May 12, 2018, 5:20 PM Stephen J. Turnbull <
> turnbull.stephen.fw at u.tsukuba.ac.jp> wrote:
>
>> David Mertz writes:
>>
>>  > Only the BDFL has a vote with non-zero weight.
>>
>> "Infinitesimal" != "zero".
>>
>> Pedantically yours,
>>
>> --
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