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devel / comp.lang.python / []=[]

SubjectAuthor
* []=[]Stefan Ram
+- []=[]Alan Bawden
+* []=[]Greg Ewing
|`- []=[]Rob Cliffe
`* []=[]Stefan Ram
 `* []=[]Piergiorgio Sartor
  `- []=[]Chris Angelico

1
[]=[]

<assignment-20230922174933@ram.dialup.fu-berlin.de>

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: []=[]
Date: 22 Sep 2023 16:51:09 GMT
Organization: Stefan Ram
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 by: Stefan Ram - Fri, 22 Sep 2023 16:51 UTC

[]=[]

(Executes with no error.)

Re: []=[]

<86ttrlu6ul.fsf@williamsburg.bawden.org>

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From: alan@csail.mit.edu (Alan Bawden)
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: Fri, 22 Sep 2023 19:27:14 -0400
Organization: ITS Preservation Society
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 by: Alan Bawden - Fri, 22 Sep 2023 23:27 UTC

ram@zedat.fu-berlin.de (Stefan Ram) writes:

[]=[]

(Executes with no error.)

So does:

() = ""

Re: []=[]

<kn753vF32b5U1@mid.individual.net>

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From: greg.ewing@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: Sat, 23 Sep 2023 15:41:47 +1200
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 by: Greg Ewing - Sat, 23 Sep 2023 03:41 UTC

On 23/09/23 4:51 am, Stefan Ram wrote:
> []=[]
>
> (Executes with no error.)

#####
[]=[]
( 1 )
#\_/#

(Executes with no error.)

--
Greg

Re: []=[]

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: 23 Sep 2023 07:41:53 GMT
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 by: Stefan Ram - Sat, 23 Sep 2023 07:41 UTC

ram@zedat.fu-berlin.de (Stefan Ram) writes:
>[]=[]

I was watching a video of a David Beazley talk "Python
Concurrency From the Ground Up" , where he wrote

can_recv, can_send, [] = select(recv_wait, send_wait, [])

. Later, he clarified that he actually wanted to write

can_recv, can_send, _ = select(recv_wait, send_wait, [])

and that he was surprised how the "[]" gave no error.
("I wonder why that works.")

Re: []=[]

<jlq2uj-of8.ln1@lazy.lzy>

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From: piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de (Piergiorgio Sartor)
<piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de>
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: Sat, 23 Sep 2023 12:18:59 +0200
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 by: Piergiorgio Sartor - Sat, 23 Sep 2023 10:18 UTC

On 23/09/2023 09.41, Stefan Ram wrote:
> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>> []=[]
>
> I was watching a video of a David Beazley talk "Python
> Concurrency From the Ground Up" , where he wrote
>
> can_recv, can_send, [] = select(recv_wait, send_wait, [])
>
> . Later, he clarified that he actually wanted to write
>
> can_recv, can_send, _ = select(recv_wait, send_wait, [])
>
> and that he was surprised how the "[]" gave no error.
> ("I wonder why that works.")

If you try:

[] = [1]

and check the error, it will be clear how it works.
Maybe not why... :-)

bye,

--

piergiorgio

Re: []=[]

<mailman.344.1695661013.23016.python-list@python.org>

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From: rosuav@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: Tue, 26 Sep 2023 02:56:39 +1000
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<video-20230923083956@ram.dialup.fu-berlin.de> <jlq2uj-of8.ln1@lazy.lzy>
 by: Chris Angelico - Mon, 25 Sep 2023 16:56 UTC

On Tue, 26 Sept 2023 at 02:52, Piergiorgio Sartor via Python-list
<python-list@python.org> wrote:
>
> On 23/09/2023 09.41, Stefan Ram wrote:
> > ram@zedat.fu-berlin.de (Stefan Ram) writes:
> >> []=[]
> >
> > I was watching a video of a David Beazley talk "Python
> > Concurrency From the Ground Up" , where he wrote
> >
> > can_recv, can_send, [] = select(recv_wait, send_wait, [])
> >
> > . Later, he clarified that he actually wanted to write
> >
> > can_recv, can_send, _ = select(recv_wait, send_wait, [])
> >
> > and that he was surprised how the "[]" gave no error.
> > ("I wonder why that works.")
>
> If you try:
>
> [] = [1]
>
> and check the error, it will be clear how it works.
> Maybe not why... :-)
>

Note that the reason it gives no error is that select() returned an
empty iterable as the third value. And you can be sure that it will
ALWAYS return an empty iterable, because select() returns three values
that correspond to the three parameters, and are subsets of them -
that is to say, everything in can_recv must have previously been in
recv_wait, and everything in can_send must have been in send_wait.
Since the third (waiting for exceptional conditions) was empty, there
can't ever be anything to return, and so [] will work, and unpack zero
elements.

ChrisA

Re: []=[]

<mailman.345.1695742786.23016.python-list@python.org>

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From: rob.cliffe@btinternet.com (Rob Cliffe)
Newsgroups: comp.lang.python
Subject: Re: []=[]
Date: Sun, 24 Sep 2023 23:42:18 +0100
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<kn753vF32b5U1@mid.individual.net>
 by: Rob Cliffe - Sun, 24 Sep 2023 22:42 UTC

It's not a bug, it's an empty unpacking.
Just as you can write
    [A,B] = [1,2] # Sets A to 1, B to 2
Best wishes
Rob Cliffe

On 23/09/2023 04:41, Greg Ewing via Python-list wrote:
> On 23/09/23 4:51 am, Stefan Ram wrote:
>> []=[]
>>
>>    (Executes with no error.)
>
> #####
> []=[]
> ( 1 )
> #\_/#
>
> (Executes with no error.)
>

devel / comp.lang.python / []=[]

1
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