[Python-ideas] Proposal: A Reduce-Map Comprehension and a "last" builtin

[Peter O'Connor]

Seems to me it's much more obvious that "name:=expression" is assigning
expression to name than "name!expression".  The ! is also confusing because
"!=" means "not equals", so the "!" symbol is already sort of associated
with "not"

On Fri, Apr 6, 2018 at 11:27 AM, Cammil Taank <ctaank at gmail.com> wrote:

> I'm not sure if my suggestion for 572 has been considered:
>
> ``name! expression``
>
> I'm curious what the pros and cons of this form would be (?).
>
> My arguments for were in a previous message but there do not seem to be
> any responses to it.
>
> Cammil
>
> On Fri, 6 Apr 2018, 16:14 Guido van Rossum, <guido at python.org> wrote:
>
>> On Fri, Apr 6, 2018 at 7:47 AM, Peter O'Connor <
>> peter.ed.oconnor at gmail.com> wrote:
>>
>>> Hi all, thank you for the feedback.  I laughed, I cried, and I learned.
>>>
>>
>> You'll be a language designer yet. :-)
>>
>>
>>> However, it looks like I'd be fighting a raging current if I were to
>>> try and push this proposal.  It's also encouraging that most of the work
>>> would be done anyway if ("Statement Local Name Bindings") thread passes.
>>> So some more humble proposals would be:
>>>
>>> 1) An initializer to itertools.accumulate
>>> functools.reduce already has an initializer, I can't see any controversy
>>> to adding an initializer to itertools.accumulate
>>>
>>
>> See if that's accepted in the bug tracker.
>>
>>
>>> 2) Assignment returns a value (basically what's already in the "Statement
>>> local name bindings" discussion)
>>> `a=f()` returns a value of a
>>> This would allow updating variables in a generator (I don't see the need
>>> for ":=" or "f() as a") but that's another discussion
>>>
>>
>> Please join the PEP 572 discussion. The strongest contender currently is
>> `a := f()` and for good reasons.
>>
>> --
>> --Guido van Rossum (python.org/~guido)
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>
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