On 10 Nov 2021, at 11:25 AM, Chris Angelico <rosuav@gmail.com> wrote:

On Wed, Nov 10, 2021 at 6:02 PM Christopher Barker <pythonchb@gmail.com> wrote:

On Mon, Nov 8, 2021 at 11:22 PM Rob Cliffe via Python-ideas <python-ideas@python.org> wrote:

I have more than once advocated
    x:=default
(and there is no clash with the walrus operator, even if others have
said/implied that there is).

not a clash, but you could have a walrus in the default expression, which could be pretty visually confusing. On the other hand, maybe that's a really bad idea anyway. And otherwise I like it.

BTW, there is one other small wrinkle with the := spelling, which is
that it's very similar to annotation syntax:

def spam(a:int=1): ...
def ham(a:=1): ...

Again, not a fundamental problem to the parser, since an empty
expression isn't a valid annotation, but could be confusing.

I don't think we're going to get away from that confusion. There are
just too many things we want to do with the equals sign, and only so
many keys on most people's keyboards.

ChrisA
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