On 2018-07-23 13:04, Giampaolo Rodola' wrote:
On Mon, Jul 23, 2018 at 3:12 AM Steven D'Aprano <st...@pearwood.info> wrote:
> ? has no spaces, it's literally "variable names interrupted by
> question marks" and evaluation can stop at any time while scanning the
> line from left to right.
Just like ordinary attribute access.
This is the point I was making earlier: you accept existing punctuation
doing these things:
try:
obj.spam.egsg.tomato.cheese # oops a typo
except AttributeError:
# evaluation can stop at any time
...
while demanding a higher standard for new punctuation.
All of your criticisms of ? punctuation applies to . as well.
I don't think they do. For once, "a.b" does one and one thing only,
"a?.b" does two and that's a fundamental difference (explicitness). It
does so by introducing a brand new operator ("?") which can be spelled
in two forms ("a?.b" and "a?[b]") by using two adjacent symbols not
interrupted by any space, which is an absolute first in the Python
syntax and that's the second and fundamental difference. I cannot move
the same criticism to the "a.b" form: it's simpler, it does one thing
and it uses one symbol.
[snip]
I think you're misunderstanding something: we're not talking about a
special operator "?" that somehow combines with existing operators,
we're talking about completely new and separate operators "?.", "?[",
etc., which resemble the existing ".", "[", etc.
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