On 15/10/20 1:59 pm, Tim Peters wrote:
I suggested following the standards' rules (the constructor works the
same way as everything else - it rounds) for Python's module too, but
Mike Cowlishaw (the decimal spec's primary driver) overruled me on
that.
Did he offer a rationale for that?
--
Greg
This all seems a pretty artificial argument.
In plain English, "1/3" is not exactly representable in decimal form, but
something like 0. *
0.22 *is* (assuming the inputs are what they
appear).
Since the spec clearly means to say "exactly represe
On Thu, Oct 15, 2020 at 11:28:36AM +1100, Chris Angelico wrote:
> Neither 1/3 nor sqrt(2) can be *exactly represented* as a decimal
> fraction.
Indeed, I am very aware of that, and in fact they were precisely the
examples I gave to question Random's assertion that inexact rounding is
something
[Steven D'Aprano ]
> ...
> (To be honest, I was surprised to learn that the context precision is
> ignored when creating a Decimal from a string. I still find it a bit odd
> that if I set the precision to 3, I can still create a Decimal with
> twelve digits.)
You're not alone ;-) In the original
On Thu, Oct 15, 2020 at 11:18 AM Steven D'Aprano wrote:
>
> On Wed, Oct 14, 2020 at 03:33:22PM -0400, Random832 wrote:
>
> > That is nonsense. "exactly representable" is a plain english phrase
> > and has a clear meaning that only involves the actual data format, not
> > the context.
>
> Perhaps y
On Wed, Oct 14, 2020 at 03:33:22PM -0400, Random832 wrote:
> That is nonsense. "exactly representable" is a plain english phrase
> and has a clear meaning that only involves the actual data format, not
> the context.
Perhaps your understanding of plain English is radically different from
mine,
[Random832 ]
[various bits of pushback, which all basically boil down to this one:}
> ...
> That is nonsense. "exactly representable" is a plain english phrase and
> has a clear meaning that only involves the actual data format, not the
> context.
The `decimal` module implements a very exacting s
On Mon, Oct 12, 2020, at 17:16, jmwar...@gmail.com wrote:
> Instead of needing a whole new class definition, wouldn't it be nice to
> just have something like:
>
>
> #notice there isn't a boilerplate custom class created!
> try:
> if some_test_that_fails(variables):
> #I still have a b
On Fri, Oct 9, 2020, at 17:38, Tim Peters wrote:
> [Random832 ]
> > My suggestion was for a way to make it so that if an exact result is
> > exactly representable at any precision you get that result, with
> > rounding only applied for results that cannot be represented exactly
> > regardless of pr
Sorry for the late response on this. I tried to respond earlier but was stymied
by issues with the mailing list server.
The last time this was discussed I was the one to raise the suggestion. You can
find the start of the thread:
25 Aug 2016: SI scale factors in Python
https://mail.pyth
On Tue, 13 Oct 2020 05:58:45 -
"Ma Lin" wrote:
>
> I heard in data science domain, the data is often huge, such as hundreds of
> GB or more. If people can make full use of multi-core CPU to compress, the
> experience will be much better than zlib.
This is true, but in data science it is ex
I can't remember unit systems for Python, do you mean third party module?
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> but Python isn't trying to have the "optimal cutting-edge" thing in its
> standard library. More like "the well-established, widely-used" thing.
I also agree with this.
At present, I have confidence in zstd. There seems to be a trend that some
programmer users are switching to zstd.
Don't k
The 2nd one.
Regards
On Wed, 14 Oct 2020, 5:47 am Steven D'Aprano, wrote:
> Hello Ankith,
>
>
> On Tue, Oct 13, 2020 at 11:37:25AM +0530, ankith abhayan wrote:
> > Hi,
> > I would like to request a new feature that allows you to clear the
> console
> > screen.
> > Like in c++, the CLS function
>
On 14.10.2020 00:35, Guido van Rossum wrote:
> Can one of the educators on the list explain why this is such a commonly
> required feature? I literally never feel the need to clear my screen -- but
> I've
> seen this requested quite a few times in various forms, often as a bug report
> "IDLE does
On Wed, Oct 14, 2020 at 6:56 PM Ma Lin wrote:
>
> > Second, why use bytes units? Not every integer value measures the amount of
> > memory. If you multiply 2 bytes by 3 bytes, do you get 6 square bytes?
>
> If a code executes m_bytes * n_bytes, it's probably a logic error.
>
> If all values have
> Second, why use bytes units? Not every integer value measures the amount of
> memory. If you multiply 2 bytes by 3 bytes, do you get 6 square bytes?
If a code executes m_bytes * n_bytes, it's probably a logic error.
If all values have a unit in a programming language, it might help us to check
Thanks for your replies, your objections are convincing.
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