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[Python-Dev] PEP 572: Assignment Expressions

Tim Peters tim.peters at gmail.com
Tue Apr 24 03:34:11 EDT 2018 
[Stephen J. Turnbull[
>> Neologisms are usually written in the other order:
>> "dead on arrival (DOA, for short)." ;-)

[Greg Ewing <greg.ewing at canterbury.ac.nz>]
> Maybe we can make use of that?
>
>    if (x - x_base) (diff) and gcd(diff, n) (g) > 1:
>
> That doesn't work, because the (...) look like function
> calls. But what if we used a different set of bracketing
> characters:
>
>    if (x - x_base) {diff} and gcd(diff, n) {g} > 1:
>
> I think that's unambiguous, because you can't currently
> put {...} straight after an expression.

As Guido noted more than once when this was still on python-ideas,
this isn't a "a puzzle" to be solved by any technical tricks
conceivable.  He's not going to accept anything in his language that
isn't at least plausibly evident.  There's a long & distinguished
history of other languages using ":=" for binding, which is why that
one gained traction before this moved to python-dev.


> To make it look even more like a neologism definition,
> we could require the bound names to be all-uppercase. :-)
>
>    if (x - x_base) {DIFF} and gcd(DIFF, n) {G} > 1:
>       return G

Yes - now you're on the right track ;-)
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