e and energy be better aimed at fixing the standard rather than
> making Python's JSON encoder broken by default?
>
You're kidding, right?
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ntaxError in statement mode, it
> would simply produce a different ast node:
>
> * `del x` -> `Delete(x)` (as `x := 0` -> SyntaxError)
> * `(del x)` -> `Expr(DeleteExpr(x))` (as `(x := 0)` ->
> `Expr(NamedExpr(...))`)
>
> Eric
>
> On Fri, 12 Jun 2020 at 17:21,
would seem to have no choice
but to print the returned value -- the REPL has no indication that it came
from `del`.
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ad, so we can lay this
one to rest.)
All in all, it's clear that there's no future for this idea, and I will
happily withdraw it.
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;>> print "hello world"
hello world
>>> print "hello", input("Name:")
Name:Guido
hello Guido
>>> print 1, 2, 3, sep=", "
1, 2, 3
>>>
But wait, there's more! The same syntax will make it possible to call *any*
function:
>>&g
n how to best structure your gradual
migration within asyncio's current limitations, rather than trying to
propose deep changes to the standard library.
Sorry the news is not better, but you will be better off this way.
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It's nice to fantasize about RAM disks, but the code in zipfile.py is
begging for a simpler solution, just pass in a wrapper that overrides the
write() method (you may have to make a few changes but you can develop and
test this separately from the fix for your bug).
--
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g(f(x)). The professor starts by showing f(x), and then shows how you can
apply g() to the result, and lo, you have defined g*f.
(I'm sorry, I refuse to learn how to type the symbol they actually use. :-)
On Sun, May 24, 2020 at 2:17 PM Tim Peters wrote:
> [Guido]
> >> I’ve never bee
t;% group_by(Species) %>% summarize_if(is.numeric, mean) %>%
>> ungroup() %>% gather(measure, value, -Species) %>% arrange(value)
>>
>>
>> It's not abstract composition since it always starts with a concrete
>> object the several operations work on. Bu
wouldn't try patching it for *all* tests though -- there are many
tests that might fail due to such a change. It also wouldn't help for file
operations made directly from C code.
--Guido
On Thu, May 21, 2020 at 6:57 AM Steve Barnes wrote:
> The issue is simple and simple enough for a beginner to f
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turn type* of a function.
This is because static checkers have a hard time with such APIs.
(Almost-example: open(..., "rb") returns an IO[bytes] while open(..., "r")
returns an IO[str].)
PS. Why wasn't a new builtin zip_strict() on the menu? I think I would have
given it at l
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at e.g. bytes.index(bytearray(...), b)
works, we should document it in the stdlib docs, and other Python
implementations will have to support this too.
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<http://
On Mon, May 4, 2020 at 10:03 Antoine Pitrou wrote:
> Of course, that's why I originally suggested that `Dict[...]` should be
> spelled `Dict(...)` instead.
...and we’d be hosed now with no path from Dict to dict.
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elopment
> - wxPython, numpy, scipy, Cython
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Okay, that's fair. So the argument really comes down to backwards
compatibility (which is inconvenient but important).
On Sat, May 2, 2020 at 1:51 PM Dominik Vilsmeier
wrote:
> `frozenset` and `set` make a counterexample:
>
> >>> frozenset({1}) == {1}
> True
> On 0
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*
programmer is
familiar with that tradition. (Maybe there's a traditional "round" operator
in some field of math commonly practiced by numpy users that I've never
heard of?)
--Guido
On Fri, May 1, 2020 at 7:42 PM Andrew Barnert via Python-ideas <
python-ideas@python.org> wrote:
> On
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>
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*Pronouns: he/him **(why i
nsue because
destructors/finalizers are running *earlier* than expected. ;-)
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y
(maybe just with -O).
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ome useful places where
we wouldn't even have thought of this idea, and we might see a modest
memory saving for most programs.
Can anyone tear this idea apart?
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s what it's
optimized for. Also note that it only applies to use cases where the data
does, indeed, fit in the process's memory somewhat easily -- else you
should probably use a temporary file. If the filesystem were fast enough
and temporary files were easier to use we wouldn't have needed it.
-
< is the strict subset operator. <= is subset. What more can I say?
On Mon, Mar 23, 2020 at 02:01 Steven D'Aprano wrote:
> On Sun, Mar 22, 2020 at 09:49:26PM -0700, Guido van Rossum wrote:
> > On Sun, Mar 22, 2020 at 6:51 PM Steven D'Aprano
> wrote:
> >
> > >
1}.issubset({1})
True
Or did I miss a wink?
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___
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The only ways to use this function without counting is remove 1 prefix
>> or remove all.
>>
>
Please, please. removeprefix/removesuffix do not need a count. The use case
is quite different from that of replace. And they should only remove (at
most) one prefix or suffix.
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do their
> magic.
>
It seems a simple enough idea. But unless you are a current contributor to
one of the existing static type checkers I don't think you have the context
to know how disruptive this would be.
> But that is also, unfortunately, pushing more work onto them and other
> t
I think we should try to get PEP 604 accepted, with the runtime option (a),
since that's the way we've gone already.
PEP 604 proposes the right syntax, and I think mostly the right semantics
(one could quibble about whether isinstance()/issubclass() ought to accept
unions). Unfortunately it does
requires that the
loop control variable retain the last value assigned to it. But in
comprehensions it might work, since the comprehension control variable
lives in an inner scope (at least if it's a simple variable).
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se):
> ...
>
Maybe. FWIW, I looked at what a few other languages offer, and found that
in Go, they use Trim(s, chars) for our s.strip(chars), and they have
separate TrimPrefix and TrimSuffix methods. That seems the best solution of
the bunch, so I am now okay with using stripprefix and s
'm perfectly okay with bytes() not having those methods. ;-)
>>>
>>> If heavy users of bytes want these methods, they can request them
>>> separately. There's no backwards compatibility requirement for new
>>> string methods to be automatically added to bytes.
>>>
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On Tue, Mar 3, 2020 at 10:43 AM Steve Jorgensen wrote:
> Guido van Rossum wrote:
> > I think it’s usually called Orderable. It’s a useful concept in static
> type
> > checking too (e.g. mypy), where we’d use it as an upper bound for type
> > variables, if we had it. I gue
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, doesn’t seem very promising.
>>
>> All in all, this whole NoneError thing seems like it could be a useful
>> design for a brand-new Python-like language, but I can’t see how it can be
>> retrofitted usefully into Python.
>>
>>
>> This might well be true! I
> extensive and growing list of audit events that are intended to assist
> > with testing, logging and security monitoring.
>
> Thanks, It looks like an audit hook could work.
>
But understand that these are meant for a totally different purpose.
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--Guido van Rossum (python.o
nd of translation of
the OP's original example (Lottery ~ Literacy + Wealth + Region) to a
lambda involving those words?
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ritten y = x1 + x2 + e) that, given the asserted relationship and some
> assumptions, we can use to find the mathematical relationship between the
> variables.
>
> I think our biggest concern is, what Guido earlier alluded to here, is, is
> the operator precedence correct? In R (and Pat
MWG7KM5O42TVVK3GUUXFZTB6LYUROQ/
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>
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*Pronouns: he/
uot; isn't
enough. Is there an existing function in one of the libraries you mention
that has the desired behavior (in the context of that library)? That would
help.
--Guido
On Sun, Feb 23, 2020 at 4:58 PM Aaron Hall via Python-ideas <
python-ideas@python.org> wrote:
> Guido, thank you so
se in R.
>
> --
> Brendan Barnwell
> "Do not follow where the path may lead. Go, instead, where there is no
> path, and leave a trail."
> --author unknown
> _______
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On Tue, Feb 18, 2020 at 11:09 AM Serhiy Storchaka
wrote:
> 18.02.20 20:13, Guido van Rossum пише:
> > I am a little confused how you get from "there are extra frames in the
> > traceback" to "modify exec() to run code in another frame".
>
> Sorry for s
fferently: for a mapping, iteration
yields keys, while for a sequence, it yields values. A legitimate question
that comes up from time to time is actually how to *distinguish* between
mappings and sequences -- se the other python-ideas thread that I mentioned
previously.
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--Guido van Rossum (py
rt amount of time, and most of them have generated little of use to
the Python community. Please think about how you can contribute something
more constructive.
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>
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gt;> https://mail.python.org/archives/list/python-ideas@python.org/message/7ZQE3IB4NR7ZPLLKWIY54PW3X5K6YWUF/
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>>
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hat would actually be quite useful for debugging purposes (I had to
> access ``future._state`` several times while testing the new
> *cancel_futures*), I'd be willing to work on implementing something like
> this.
>
Excellent!
>
> On Sat, Feb 15, 2020 at 10:16 PM Guido van Rossum
t;> I may well be missing something that makes some of these choices
>> necessary or desirable. But otherwise, I think we’d be better off adding a
>> SerialExecutor (that works with the existing Future type as-is) but not
>> adding or changing anything else.
>>
>>
>
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y and Planning Science
> http://turnbull/sk.tsukuba.ac.jp/ Faculty of Systems and Information
> Email: turnb...@sk.tsukuba.ac.jp University of Tsukuba
> Tel: 029-853-5175 Tennodai 1-1-1, Tsukuba 305-8573 JAPAN
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Honestly I don't see why the PEP even needs to bring up the matrix multiply
operator. There is no ambiguity, and there is no backwards compatibility
issue.
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*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-us
uestion:) How could my_int_maker(1, 00, 23) return 10023?
>>
>
> Sorry I haven't been on the list long: does "rhetorical question" mean the
> same thing to the Dutch as to Americans? ;)
>
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--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun h
gt;
> P = my_int_maker(29674495668685510550154174642905332730771991,
> 79985304335099507553127683875317177019959423,
> 8596428121188033664754218345562493168782883)
>
(Rhetorical question:) How could my_int_maker(1, 00, 23) return 10023?
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&
ibrary/concurrent.futures.html#concurrent.futures.Executor.shutdown
>
> For implementation details, see the PR:
> https://github.com/python/cpython/pull/18057
>
> Also, thank you Guido for bringing attention to the issue. The
> implementation was a bit more involved than I initially anticipated
>
, where I feel it's fair to tell the participants to stop or take it
elsewhere.
On Sun, Feb 2, 2020 at 01:39 Johan Vergeer wrote:
> Hi Guido,
>
> This thread had a lot of comments so far, both people that are pro and
> con.
> To be honest, a lot of you are a smarter and more expe
The whole feature.
On Sat, Feb 1, 2020 at 14:35 Greg Ewing wrote:
> On 2/02/20 6:12 am, Guido van Rossum wrote:
>
> > Alex, this is not ever going to be added to Python,
>
> For clarity, are you rejecting the whole idea of a "nameof" feature,
> or jus
(objects, whatever) when we write
>> Python, we bind names to values with the = operator. (And other namespace
>> trickery). Some types of objects do have a __name__ attribute: classes,
>> functions created with def.
>>
>> But that name is on
Well, mypy is often used primarily as a linter on steroids.
Anyway, agreed with your point!
On Tue, Jan 21, 2020 at 10:22 AM Andrew Barnert wrote:
> On Jan 19, 2020, at 20:54, Guido van Rossum wrote:
> >
> > Actually, `bar = foo` is more likely to be detected by mypy, since i
On Sun, Jan 19, 2020 at 8:16 PM Andrew Barnert wrote:
> On Jan 19, 2020, at 15:20, Guido van Rossum wrote:
>
>
> On Sun, Jan 19, 2020 at 3:10 PM Tim Peters wrote:
>
>> [Guido, on Pythons before 1.0.2 always printing non-None expression
>>
On Sun, Jan 19, 2020 at 3:10 PM Tim Peters wrote:
> [Guido, on Pythons before 1.0.2 always printing non-None expression
> statement results]
> > Heh. That was such a misfeature that I had thoroughly suppressed any
> > memory of its existence. -k indeed. :-)
>
> I prefer
Heh. That was such a misfeature that I had thoroughly suppressed any memory
of its existence. -k indeed. :-)
On Sun, Jan 19, 2020 at 1:33 PM Tim Peters wrote:
> [Guido]
> > Sounds like a hallucination or fabrication.
>
> Nope! Turns out my memory was right :-)
>
> >
alls, each
> returning `self`, and so their output was littered with crap they
> didn't want to see. They didn't want to prefix every computational
> statement with, e.g., "ignore = ", so Guido stopped the magical
> output.
>
> Perhaps surprisingly, few people
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--
--Guido van Rossum (pytho
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> Code of Conduct: http://python.org/psf/codeofconduct/
>
--
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/201
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>
--
--Guido (mobile)
___
parser architecture, keeping track of a lot more state, or
> partially re-parsing things in the error handler. (If it were easy, Guido
> would have done it back in 1.x.)
>
> But maybe there’s a way to heuristically detect that these problems are
> _likely_ causes of the error (with
OK, since the current behavior of shutdown() is "disallow submitting new
futures and wait for all currently queued futures to be processed", we
definitely need a new flag.
It looks like you have a good handle on the code -- do you want to submit a
PR to GitHub to add such a parameter?
--
to do this in shutdown()
after it has set self._shutdown but before it waits for the worker threads.
--Guido
On Fri, Jan 3, 2020 at 10:10 AM Miguel Ángel Prosper <
miguelangel.pros...@gmail.com> wrote:
> > Having a way to clear the queue and then shutdown once existing jobs are
>
, 2019 at 9:35 PM Guido van Rossum wrote:
> There were match proposals in the past — have you looked those up? Maybe
> they solve your problem without that syntax — or maybe they would benefit
> from it.
>
> On Tue, Dec 31, 2019 at 19:20 Andrew Barnert via Python-ideas <
> py
org
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&g
won't
want to slow down computations with O(N) type checks.
IIUC there are existing packages that expose decorators that do this, but I
have never tried to use them.
--Guido
On Tue, Dec 24, 2019 at 6:37 AM Andrew T wrote:
> This is a feature PHP has had since PHP7 and is what I use
Well, I should have read the source instead of the docs. :-( Contrary to
what I thought, move() always preserves symlinks.
Let's stop second-guessing until the OP responds.
On Fri, Dec 20, 2019 at 11:43 Random832 wrote:
> On Thu, Dec 19, 2019, at 17:43, Guido van Rossum wrote:
> > A q
gt; Python-ideas mailing list -- python-ideas@python.org
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nderscore as well to actually use it.)
>
> But I think Python is more dependent on its package ecosystem than most of
> those languages (despite being the one that advertises “batteries
> included”), and I’m not sure that’s a bad thing here any more than anywhere
> else. The set of usef
ng already
(I should have kept it muted :-).
On Mon, Dec 9, 2019 at 8:56 PM Tim Peters wrote:
> [Guido]
> > ...
> > Similarly, there is already a spelling of first() (or close enough) that
> raises: 1-arg next().
> > If 1-arg first() would also raise, it would fail
ment from a set -- it's
not like the iteration order is a secret, and it's not called "lowest". The
other schemes to get one item out of a set in O(1) time will return the
same element, since the only sensible way to do it is to iterate and stop
after one iteration.
--
--Guido van Rossum (py
One more and then I'll let this go.
On Mon, Dec 9, 2019 at 10:49 AM Andrew Barnert wrote:
> On Dec 8, 2019, at 21:41, Guido van Rossum wrote:
>
> I do have to admit that I'm probably biased because I didn't recall 2-arg
> next() myself until it was mentioned in this thread.
>
&
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