On Sun, 19 Jan, 2020, 11:35 Inada Naoki, wrote:
> On Sun, Jan 19, 2020 at 2:45 PM Siddharth Prajosh
> wrote:
> >
> > Moreover, shouldn't it work?
> > How do I add that feature in Python?
>
> How you can do it with warus operator.
>
> >>> (xs := list(range(10))).append(42)
> >>> xs
> [0, 1, 2, 3,
On Fri, Jan 17, 2020, at 21:32, Josh Rosenberg wrote:
> The colon remains syntactically necessary in some cases, particularly
> to disambiguate cases involving one-lining (no block involved). Stupid
> example: If the colon is optional, what does:
I was only proposing making it optional in the mu
I'm not excited about suggesting the walrus operator when people want to
chain mutating method calls like this. It results in ugly code with way too
many parentheses and a distinctly un-Pythonic flavor. I hope the OP doesn't
go off and infect a whole subcommunity with this idiom.
On Sat, Jan 18, 2
On Sun, Jan 19, 2020 at 10:03 PM Guido van Rossum wrote:
> I'm not excited about suggesting the walrus operator when people want to
> chain mutating method calls like this. It results in ugly code with way too
> many parentheses and a distinctly un-Pythonic flavor. I hope the OP doesn't
> go off
The "fluent interface" (https://en.wikipedia.org/wiki/Fluent_interface) is
popular in many programming languages, including in the sort of
"mini-language" Pandas, within portion.
But it is definitely not Pythonic. The Wikipedia article even shows how you
*could* do it in Python, but mentions that
[David Mertz ]
> ...
> What we get instead is a clear divide between mutating methods
> on collections that (almost) always return None, and functions
> like sorted() and reversed() that return copies of the underlying
> collection/iterable. Of course, there are many methods that don't
> have func
Sounds like a hallucination or fabrication. The behavior of `for i in
range(10): i` in the REPL exists to this day, and list.append() never
returned a value.
The only thing I'm only 90% sure of is whether the REPL always ignored None
values.
On Sun, Jan 19, 2020 at 11:58 AM Tim Peters wrote:
>
On Sun, Jan 19, 2020 at 2:57 PM Tim Peters wrote:
> [David Mertz ]
> > What we get instead is a clear divide between mutating methods
> > on collections that (almost) always return None, and functions
> > like sorted() and reversed() that return copies of the underlying
> > collection/iterable.
On Sun, Jan 19, 2020 at 08:32:43AM -0800, Guido van Rossum wrote:
> I'm not excited about suggesting the walrus operator when people want to
> chain mutating method calls like this. It results in ugly code with way too
> many parentheses and a distinctly un-Pythonic flavor. I hope the OP doesn't
>
On Sun, Jan 19, 2020 at 02:37:14PM -0500, David Mertz wrote:
> The "fluent interface" (https://en.wikipedia.org/wiki/Fluent_interface) is
> popular in many programming languages, including in the sort of
> "mini-language" Pandas, within portion.
I can't speak about Pandas, but what the OP is expec
On Jan 19, 2020, at 12:15, David Mertz wrote:
>
> In contrast, in pure Python, most of that you do is in loops over the
> elements of collections. In that case is does a good job of drawing your eye
> to the fact that a method is called but not assigned to anything. When I see
> `mylist.appe
On Sun, Jan 19, 2020 at 3:56 PM Steven D'Aprano wrote:
> > The "fluent interface" (https://en.wikipedia.org/wiki/Fluent_interface)
> is
> > popular in many programming languages, including in the sort of
> > "mini-language" Pandas, within portion.
>
> I can't speak about Pandas, but what the OP i
[Guido]
> Sounds like a hallucination or fabrication.
Nope! Turns out my memory was right :-)
> The behavior of `for i in range(10): i` in the REPL exists
> to this day, and list.append() never returned a value.
Sure, but those weren't the claims. The claim was that the result of
an expression
I should really upgrade to 1.02!
% python
Python 1.0.1 (Jul 15 2016)
Copyright 1991-1994 Stichting Mathematisch Centrum, Amsterdam
>>> def f():
... for i in range(5): i
...
>>> f()
0
1
2
3
4
On Sun, Jan 19, 2020 at 4:33 PM Tim Peters wrote:
> [Guido]
> > Sounds like a hallucination or fabri
> On Jan 19, 2020, at 12:57, Steven D'Aprano wrote:
>
> On Sun, Jan 19, 2020 at 02:37:14PM -0500, David Mertz wrote:
>> The "fluent interface" (https://en.wikipedia.org/wiki/Fluent_interface) is
>> popular in many programming languages, including in the sort of
>> "mini-language" Pandas, within
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 :-)
>
> > The behavior of `for i in ra
We have importlib. We have importlib.resources. We can import modules.
We cannot (yet) import resources using the same-ish module import machinery.
It would be nice if we could.
I'm thinking of something like:
from foo.bar import resources "foo.txt" as foo, "bar.txt" as bar #
string imports
f
[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 to think of it as a bit of genius :-)
The natural desire to avoid mounds of useless out
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 to think of it as a bit o
On 2020-01-19 8:49 p.m., Tener Hades wrote:
> def unpack_defaults():
> open("templates/index.html", "w").write(f"{from ganarchy.templates
> import 'index.html'}")
This is non-idiomatic to not only Python, but any language I've seen
thus far in my career.
What does this achieve which readi
On Sun, Jan 19, 2020 at 11:59 AM Tim Peters wrote:
> For a bit of history that I may have made up (heh - memory fades over
> time!), as I recall, the very first Python pre-releases echoed to
> stdout every non-None statement result.
which is what MATLAB does, if you don't put a semi-colon at th
By the way, if anyone is actually interested in this other than for
nostalgia , there have been a number of lengthy discussion on this list
about "Fluent" interfaces for Python. LIke this one for instance:
https://groups.google.com/forum/#!searchin/python-ideas/Method$20Chaining%7Csort:date/python
note that there is a FAQ about this:
https://docs.python.org/3/faq/design.html#why-are-colons-required-for-the-if-while-def-class-statements
And if you google hard enough (my 30 seconds wasn't enough), I'm pretty
sure you can find a description of actual usability tests (if informal)
mack in the
On Jan 19, 2020, at 15:10, Soni L. wrote:
>
> We have importlib. We have importlib.resources. We can import modules. We
> cannot (yet) import resources using the same-ish module import machinery.
First, do you know about setuptools resources? It’s not exactly what you’re
looking for, but it h
On 2020-01-20 12:48 a.m., Andrew Barnert wrote:
On Jan 19, 2020, at 15:10, Soni L. wrote:
>
> We have importlib. We have importlib.resources. We can import modules. We cannot (yet) import resources using the same-ish module import machinery.
First, do you know about setuptools resources? I
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
>> statement results]
>> > Heh. That was such a misfeature that I had thoroughly suppressed any
>> > memory of its exi
On Jan 19, 2020, at 20:13, Soni L. wrote:
>
>
>> On 2020-01-20 12:48 a.m., Andrew Barnert wrote:
>> On Jan 19, 2020, at 15:10, Soni L. wrote:
>> > > We have importlib. We have importlib.resources. We can import modules.
>> > > We cannot (yet) import resources using the same-ish module import
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
>> statement results]
>> > Heh. That was such a misfeature
On 2020-01-20 1:52 a.m., Andrew Barnert wrote:
On Jan 19, 2020, at 20:13, Soni L. wrote:
>
>
>> On 2020-01-20 12:48 a.m., Andrew Barnert wrote:
>> On Jan 19, 2020, at 15:10, Soni L. wrote:
>> > > We have importlib. We have importlib.resources. We can import modules.
We cannot (yet) impor
On Mon, Jan 20, 2020 at 5:23 PM Soni L. wrote:
> What the eff is this then?
> https://docs.python.org/3/library/importlib.html#module-importlib.resources
>
> Because I'm pretty sure this is literally part of the existing import
> machinery. Because importlib *is* the existing import machinery. But
On Jan 19, 2020, at 22:22, Soni L. wrote:
>
>
>> >> > or maybe:
>> >> > > foo = f"{from foo.bar import 'foo.txt'}" # string imports
>> >> > bbar = fb"{from foo.bar import 'bar.txt'}" # bytes imports
>> >> >> This version would require turning import from a statement into an
>> >> >> expressio
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