[Python-Dev] assignment expressions: an alternative proposal (original) (raw)

Yury Selivanov yselivanov.ml at gmail.com
Tue Apr 24 11:49:28 EDT 2018

On Tue, Apr 24, 2018 at 11:34 AM, Steven D'Aprano <steve at pearwood.info> wrote:

On Tue, Apr 24, 2018 at 11:05:57AM -0400, Yury Selivanov wrote:

Well, myfunc(a=(b:=foo)) or myfunc(b:=foo) are also barely readable to my eye. There's no advantage to using binding-expressions unless you're going to re-use the name you just defined, and that re-use will give you a hint as to what is happening: myfunc(arg, buffer=(buf := [None]*getsize()), size=len(buf))

Again, this is very subjective, but this code would fail my code review :)

Don't you find

buf = [None] * get_size() my_func(arg, buffer=buf, size=len(buf))

to be more readable?

IMHO this example is why we shouldn't implement any form of assignment expressions in Python :)

Yury

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