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devel / comp.lang.python / RE: walrus with a twist :+= or ...

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o RE: walrus with a twist :+= or ...Avi Gross

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RE: walrus with a twist :+= or ...

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Subject: RE: walrus with a twist :+= or ...
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 by: Avi Gross - Thu, 28 Oct 2021 02:50 UTC

Correct, I left out a bit, not wisely.

I am trying to remember the last time (outside of classes) I have ever had
to use bitwise operators nontrivially and it may have been around 1980 when
I had to implement an encryption algorithm. Of course, when I was working in
UNIX, I often had to combine bitwise things to specify all kinds on 1-bit
flags when say opening a file.

So we now have so many candidates FOR COMPLETENESS to add as variants of the
Walrus operator, that I might vote to do NONE of them, if anyone ever asked.

I do want to remind people though that these operators often serve a purpose
in Python as using them means you do not need to specify an argument twice
and you can specify some dunder methods that make it more efficient to type:

obj += obj2

rather than

obj = obj + obj2

So there may be a valid argument, not just about completeness, to implement
something BUT as we got along fine before a walrus came along, ...

or did we?

-----Original Message-----
From: Python-list <python-list-bounces+avigross=verizon.net@python.org> On
Behalf Of MRAB
Sent: Wednesday, October 27, 2021 9:21 PM
To: python-list@python.org
Subject: Re: walrus with a twist :+= or ...

On 2021-10-28 02:06, Avi Gross via Python-list wrote:
> I just realized I left out **= so my apologies. Are there other such
> abbreviations and does anyone use them?
>
You forgot about the bitwise operators: |= &= ^=

> -----Original Message-----
> From: Python-list
> <python-list-bounces+avigross=verizon.net@python.org> On Behalf Of Avi
> Gross via Python-list
> Sent: Wednesday, October 27, 2021 8:57 PM
> To: python-list@python.org
> Subject: walrus with a twist :+= or ...
>
> I realized that the person seeking completeness in Python may next ask
> why the Walrus operator, :=, is not properly extended to include a
> whole assortment of allowed assignment operators
>
>
> I mean in normal python programs you are allowed to abbreviate
>
> x = x + 5
>
> with
>
> x += 5
>
> Similarly you have other operators like
>
> x *= 2
>
> And, of course, the constantly used operator:
>
> x %= 2
>
> So how does one extend a walrus operator if they ever decide to give
> in and add it to the language just for completeness?
>
> Sadly, a simple test shows they neglected to use a :+= operator in the
> latest:
>
>>>> (walrus := 2)
>
> 2
>
>>>> walrus
>
> 2
>
>>>> (wallrus :+= 2)
>
> File "<stdin>", line 1
>
> (wallrus :+= 2)
>
> ^
>
> SyntaxError: invalid syntax
>
> (Yes, I know how to spell walrus, but making a point.)
>
> On a serious note, if it was ever considered a good idea, what would
> be an acceptable sequence of symbols that might not break or confuse
> existing programs and what would we call it? I mean what animal, of
course.
>
> What do these look like in some fonts? :+= :-= :*= :/= :%=
>
> Or do we not just add a colon in front and make it a tad different as in
:=+
> or :+=: or maybe realize the futility of perfection! After all, you can
> easily use some functions to get a result such as:
>
> x := func(x, "+", 5)
>
> x := func_add(x, 5)
>
> or many other work-arounds.
>
> Can we all forget I asked? I am sort of being sarcastic.
>
--
https://mail.python.org/mailman/listinfo/python-list

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