`->` would not be ambiguous in the proposed cases, but it does already
mean something elsewhere in the language as of 3.5:
def concat(a: str, b: str) -> str:
return a + b
This could potentially cause confusion (as with the % operator being
used for modulo as well as string formatting).
On Tue, Mar 12, 2019 at 10:58 AM Nick Timkovich <prometheus...@gmail.com> wrote:
>
> In general, there is lots of code out in the wild that can't be updated for
> whatever reason, e.g. the person that knows Python left and it needs to
> continue to work. Weak argument, but cost-benefit I think it comes out ahead.
> In your example there isn't a reason I can tell why swapping the operands
> isn't what should be done as Calvin mentioned. The onus is on you to
> positively demonstrate you require both directions, not him to negatively
> demonstrate it's never required.
>
> I suggest you confine your proposal to `->` only, as it's currently illegal
> syntax. You would also want the reflected `__r*__` equivalent of `__arrow__`
> or `__rarrow__` (`__rrarrow__` if you also need the left-arrow...)
>
> Perhaps broadening the use of it, functions may be able to use it as a pipe
> operator, e.g. Elixir:
> https://elixir-lang.org/getting-started/enumerables-and-streams.html#the-pipe-operator
>
> On Mon, Mar 11, 2019 at 2:58 PM francismb <franci...@email.de> wrote:
>>
>> Hi Greg,
>>
>> On 3/9/19 1:42 AM, Greg Ewing wrote:
>> > Do you really want
>> > to tell them that all their code is now wrong?
>> Of course not, at least not so promptly. But, would it be still a
>> problem if the update to a new version (let say from 3.X to next(3.X))
>> is done through some kind of updater/re-writer/evolver. In that case the
>> evolver could just add the blanks. What do you think ? Could it work?
>>
>> Thanks in advance!
>> --francis
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