On 2022-05-08 11:50, Steven D'Aprano wrote:
I don't have an opinion one way or the other, but there is a discussion
on Discourse about the walrus operator:
https://discuss.python.org/t/walrus-fails-with/15606/1
Just a quick straw poll, how would people feel about relaxing the
restriction on the walrus operator so that iterable unpacking is
allowed?
# Currently a syntax error.
results = (1, 2, (a, b) := (3, 4), 5)
Doesn't ':=' have a lower precedence than ',', so you're effectively
asking it to bind:
(1, 2, (a, b))
to:
((3, 4), 5)
?
which would create the following bindings:
results = (1, 2, (3, 4), 5)
a = 3
b = 4
A more complex example:
expression = "uvwxyz"
results = (1, 2, ([a, *b, c] := expression), 5)
giving:
results = (1, 2, "uvwxyz", 5)
a = "u"
b = ("v", "w", "x", "y")
c = "z"
Thoughts?
_______________________________________________
Python-ideas mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/[email protected]/message/7IYW3X6RPEMWCTFR42Q4U7FTV3MXL6GX/
Code of Conduct: http://python.org/psf/codeofconduct/
