Op 25/10/2021 om 18:47 schreef Christman, Roger Graydon:
Message: 8
Date: Mon, 25 Oct 2021 11:20:52 +0200
From: Antoon Pardon <antoon.par...@vub.be>
To: python-list@python.org
Subject: Re: New assignmens ...
Message-ID: <5761dd65-4e87-8b8c-1400-edb821204...@vub.be>
Content-Type: text/plain; charset=utf-8; format=flowed
On 25/10/2021 11:20, Anton Pardon wrote:
Suppose I would like to write a loop as follows:
> while ((a, b) := next_couple(a, b))[1]:
> do needed calculations
What I can do is write it as follows:
while [tmp := next_couple(a,b), a := tmp[0], b := tmp[1]][-1]:
> do needed calculations
I really don't see what is gained by "forcing" me to right the second code over
the first.
No, nobody is forcing you to right it the second way over the first.
Nobody is forcing you to use the walrus operator at all!
Instead, I would recommend something more like:
while b:
do needed calculations
(a,b) = next_couple(a,b)
But AIU the walrus operator was introduced so we no longer needed, to write
such code,
with the calculation of the next candidate at the bottom and the test at the
top.
You just confirmed the walrus operator is not very useful once the next
candidate is
no longer just a name.
--
Antoon.
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