Nick: “I like Yury's example for this, which is that the following two examples
are currently semantically equivalent, and we want to preserve that equivalence:
with decimal.localcontext() as ctx:
ctc.prex = 30
for i in gen():
pass
g = gen()
with decimal.lo
On Tue, Oct 10, 2017 at 5:34 AM, Nick Coghlan wrote:
> On 10 October 2017 at 01:24, Guido van Rossum wrote:
>
>> On Sun, Oct 8, 2017 at 11:46 PM, Nick Coghlan wrote:
>>
>>> On 8 October 2017 at 08:40, Koos Zevenhoven wrote:
>>>
I do remember Yury mentioning that the first draft of PEP 5
On Tue, Oct 10, 2017 at 12:34 PM, Koos Zevenhoven wrote:
> On Tue, Oct 10, 2017 at 3:42 PM, Nick Coghlan wrote:
[..]
>> Context managers are merely syntactic sugar for try/finally statements, so
>> you can't wave your hands and say a context manager is the only supported
>> API: you *have* to bre
On Tue, Oct 10, 2017 at 3:42 PM, Nick Coghlan wrote:
> On 10 October 2017 at 22:34, Koos Zevenhoven wrote:
>
>> Really, it was my mistake to ever make you think that
>> context_var.assign(42).__enter__() can be compared to .set(42) in PEP
>> 550. I'll say it once more: PEP 555 context arguments
On Tue, Oct 10, 2017 at 12:21 PM, Koos Zevenhoven wrote:
[..]
>> Please stop using "many things .. would", "most likely" etc.
>
>
> I can't explain everything, especially not in a single email. I will use
> whatever English words I need. You can also think for yourself––or ask a
> question.
I can
On Tue, Oct 10, 2017 at 11:26 AM, Koos Zevenhoven wrote:
> On Tue, Oct 10, 2017 at 5:40 PM, Yury Selivanov
> wrote:
>>
>> On Tue, Oct 10, 2017 at 8:34 AM, Koos Zevenhoven
>> wrote:
>> > On Tue, Oct 10, 2017 at 4:22 AM, Yury Selivanov
>> >
>> > wrote:
>> >>
>> >> On Mon, Oct 9, 2017 at 8:37 PM,
On Tue, Oct 10, 2017 at 5:46 PM, Yury Selivanov
wrote:
> On Tue, Oct 10, 2017 at 10:22 AM, Koos Zevenhoven
> wrote:
> > On Tue, Oct 10, 2017 at 5:01 PM, Nick Coghlan
> wrote:
> >>
> >> On 10 October 2017 at 22:51, Koos Zevenhoven wrote:
> >>>
> >>> I see no reason why these two should be equiv
On Tue, Oct 10, 2017 at 5:40 PM, Yury Selivanov
wrote:
> On Tue, Oct 10, 2017 at 8:34 AM, Koos Zevenhoven
> wrote:
> > On Tue, Oct 10, 2017 at 4:22 AM, Yury Selivanov >
> > wrote:
> >>
> >> On Mon, Oct 9, 2017 at 8:37 PM, Koos Zevenhoven
> wrote:
> >> > You can cause unbound growth in PEP 550
On Tue, Oct 10, 2017 at 10:22 AM, Koos Zevenhoven wrote:
> On Tue, Oct 10, 2017 at 5:01 PM, Nick Coghlan wrote:
>>
>> On 10 October 2017 at 22:51, Koos Zevenhoven wrote:
>>>
>>> I see no reason why these two should be equivalent.
>>
>>
>> There is no "should" about it: it's a brute fact that the
On Tue, Oct 10, 2017 at 8:34 AM, Koos Zevenhoven wrote:
> On Tue, Oct 10, 2017 at 4:22 AM, Yury Selivanov
> wrote:
>>
>> On Mon, Oct 9, 2017 at 8:37 PM, Koos Zevenhoven wrote:
>> > You can cause unbound growth in PEP 550 too. All you have to do is nest
>> > an
>> > unbounded number of generators
On Tue, Oct 10, 2017 at 5:01 PM, Nick Coghlan wrote:
> On 10 October 2017 at 22:51, Koos Zevenhoven wrote:
>
>> I see no reason why these two should be equivalent.
>>
>
> There is no "should" about it: it's a brute fact that the two forms *are*
> currently equivalent for lazy iterators (includi
On 10 October 2017 at 22:51, Koos Zevenhoven wrote:
> I see no reason why these two should be equivalent.
>
There is no "should" about it: it's a brute fact that the two forms *are*
currently equivalent for lazy iterators (including generators), and both
different from the form that uses eager
On Tue, Oct 10, 2017 at 3:34 PM, Nick Coghlan wrote:
> On 10 October 2017 at 01:24, Guido van Rossum wrote:
>
>> On Sun, Oct 8, 2017 at 11:46 PM, Nick Coghlan wrote:
>>
>>> On 8 October 2017 at 08:40, Koos Zevenhoven wrote:
>>>
I do remember Yury mentioning that the first draft of PEP 5
On 10 October 2017 at 22:34, Koos Zevenhoven wrote:
> Really, it was my mistake to ever make you think that
> context_var.assign(42).__enter__() can be compared to .set(42) in PEP
> 550. I'll say it once more: PEP 555 context arguments have no equivalent of
> the PEP-550 .set(..).
>
Then your al
On Tue, Oct 10, 2017 at 4:22 AM, Yury Selivanov
wrote:
> On Mon, Oct 9, 2017 at 8:37 PM, Koos Zevenhoven wrote:
> > You can cause unbound growth in PEP 550 too. All you have to do is nest
> an
> > unbounded number of generators.
>
> You can only nest up to 'sys.get_recursion_limit()' number of g
On 10 October 2017 at 01:24, Guido van Rossum wrote:
> On Sun, Oct 8, 2017 at 11:46 PM, Nick Coghlan wrote:
>
>> On 8 October 2017 at 08:40, Koos Zevenhoven wrote:
>>
>>> I do remember Yury mentioning that the first draft of PEP 550 captured
>>> something when the generator function was calle
Thanks Ethan!
The PEP draft now looks good to me. I think it makes sense to make
a PoC implementation of the PEP at this point to see if everything
works smoothly in practice.
(You could also link few examples with your PoC implementation in the PEP)
--
Ivan
On 6 October 2017 at 22:00, Ethan
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