IMHO, if `->` becomes an operator with semantics,
then `[t1, ..., tn] -> tr` should mean `typing.Callable[[t1, ..., tn], tr]`.
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On 24/05/20 10:26 am, Paul Sokolovsky wrote:
On Mon, 18 May 2020 13:25:50 +1200
Greg Ewing wrote:
Or maybe we could leverage the new walrus operator and write
str := (int)
With the idea that someone may confuse ":=" for "<-", so we can swap
result and argument types comparing to their
Wouldn't it be better implemented on an editor as a display option instead of
changing python?
Because, as I understand, it's an issue of appearing nice on screen,
rather than storing (and parsing) `'\u2192'` as an alias to `'->'` on type
hints.
It *would* look nice, though
_
On 5/23/2020 6:24 PM, redrad...@gmail.com wrote:
> Hi all,
>
> I am very exciting about the sub-interpreters ... but I do not like some
> parts ...
> Consider the following code:
> ```python
> import _xxsubinterpreters as interpreters
> import threading
> import textwrap as tw
> import marshal
>
>
Hi all,
I am very exciting about the sub-interpreters ... but I do not like some parts
...
Consider the following code:
```python
import _xxsubinterpreters as interpreters
import threading
import textwrap as tw
import marshal
if __name__ == '__main__':
# Create a sub-interpreter
interpid
Hello,
On Mon, 18 May 2020 02:39:27 +0100
MRAB wrote:
[]
> > Or maybe we could leverage the new walrus operator and write
> >
> > str := (int)
> >
> It would be closer to the existing annotation if we could write:
>
> [int] -> str
To make it clear, the talk is about "better", n
Hello,
On Mon, 18 May 2020 13:25:50 +1200
Greg Ewing wrote:
> On 18/05/20 1:59 am, Paul Sokolovsky wrote:
> > But even
> > {(int): str} is a better type annotation for a function than
> > Callable[[int], str].
>
> I don't agree -- it looks more like some kind of dict type, and
> would be bett
Hello,
On Sat, 23 May 2020 21:52:47 +0900
"Stephen J. Turnbull" wrote:
> Paul Sokolovsky writes:
> > Andrey Cizov wrote:
>
> > > Sorry I forgot to add the URL:
> > > https://pypi.org/project/tagged-dataclasses/
>
> > As a quick comment, looks verbose comparing to ML ;-).
>
> Do you
A programmer making the least effort wouldn't update themselves on the grammar:
the patch would be useless.
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Christopher Barker writes:
> Interesting -- in other recent threads, Ive felt that those of us that
> thought "iterators and `next" were relatively advanced concepts that
> newbies didn't need to learn were dismissed ...
I for one don't *dismiss* that idea iterators and next are advanced,
but
On Fri, May 22, 2020 at 4:23 AM Steven D'Aprano wrote:
> In pseudo-code:
>
> - create a temporary file of 2048 bytes;
> - write a NTFS file system in that file;
> - mount that file system somewhere so it is visible;
>
> So have the test create a new file system on the fly, cd into that file
> sys
> > for obj in somelist:
> > > if comparison(obj, needle):
> > > do_something(obj)
> > > break
> People who think in functional programming terms will probably love the
> `next(filter(...))` idiom, but not everyone thinks or likes functional
> programming idioms
On Saturday, May 23, 2020, at 11:02 -0400, David Mertz wrote:
> Still, generator comprehension are great. And next() is an excellent
> function.
Agreed, on both counts. I often end up needing an arbitrary element of
a set (or the only element of a single-element set), and next(iter(set))
scrat
On Sat, May 23, 2020, 10:54 AM Rob Cliffe via Python-ideas
> index_of(needle, haystack, key=func)
>
> Sounds like a list comprehension: [ needle for needle in haystack if
> func(needle) ]
>
The times it doesn't sound like a list comprehension is when you have a
million items in the list, 100k of
On 23/05/2020 05:48, David Mertz wrote:
On Sat, May 23, 2020, 12:26 AM Steven D'Aprano
Obviously not all such key functions are that simple and you may
need to write a helper function, but the same applies to filter.
I like the key function much better than the predicate. In large pa
On 5/23/2020 8:52 AM, Stephen J. Turnbull wrote:
> Executive summary:
>
> I'd like to make three points.
>
> 1. Accessibility matters, and I think this change would be
> inaccessible to users of screen readers.
> 2. Yes, a variety of tools imposes a burden, but also confers
> benefits.
>
On Sat, May 23, 2020 at 2:52 PM Stephen J. Turnbull <
turnbull.stephen...@u.tsukuba.ac.jp> wrote:
> Alex Hall writes:
>
> > In all cases it's not immediately clear what the actual default value
> is,
> > or even what kind of object is meant to be passed to that parameter.
>
> I agree with the ba
Alex Hall writes:
> In all cases it's not immediately clear what the actual default value is,
> or even what kind of object is meant to be passed to that parameter.
I agree with the basic principle, but I'm not sure this is a very
strong argument. First, if you want to indicate what the type o
Paul Sokolovsky writes:
> Andrey Cizov wrote:
> > Sorry I forgot to add the URL:
> > https://pypi.org/project/tagged-dataclasses/
> As a quick comment, looks verbose comparing to ML ;-).
Do you mean ML, the language?
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Executive summary:
I'd like to make three points.
1. Accessibility matters, and I think this change would be
inaccessible to users of screen readers.
2. Yes, a variety of tools imposes a burden, but also confers
benefits.
3. There's no such thing as "pretty source code." There are onl
Most of the prior art to this tries to take too much from other languages
(e.g. using match as you show here).
For example they create their own DSL for matching that either introduces
the magic function for matching, which doesn’t completely support Python
classes (e.g what if I want my tagged un
On 22/05/2020 20:40, Steven D'Aprano wrote:
Imagine the confusion if somebody had variables spam, Spam, sPAM, SPam,
sPAm. Or worse, SPΑM, SPАM and SPAM.
Randall is way ahead of you. https://xkcd.com/2309/
:-)
--
Rhodri James *-* Kynesim Ltd
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