On 5/28/2022 7:57 AM, Damian Shaw wrote:
That PR seems to make \' and \" not special in general right?
I think this is a more limited proposal, to only change the behavior
when \ is at the end of a string, so the only behavior difference
would never receiving the error "SyntaxError: EOL while scanning
string literal"
How would you know where the end of a string is? I think this is one of
those things that's easy to look at for a human and figure out the
intent, but not so easy for the lexer, without some heuristics and
backtracking. If the trailing single quote is removed below, it changes
from "backslash in the middle of a string" to "backslash at the end of a
string, followed by an arbitrary expression.
r'\' + "foo"'
Eric
In which case there should be no backwards compatibility issue.
Damian
On Sat, May 28, 2022 at 12:20 PM Serhiy Storchaka
<storch...@gmail.com> wrote:
28.05.22 12:22, Steven D'Aprano пише:
> Now that we have a new parser for CPython, can we fix the old gotcha
> that raw strings cannot end in a backslash?
>
> Its an FAQ and has come up again on the bug tracker.
>
> https://docs.python.org/3/faq/design.html#id26
>
> https://github.com/python/cpython/issues/93314
I do not think that we can allow this, and it is not related to
parser.
Few years ago I experimented with such change:
https://github.com/python/cpython/pull/15217
You can see that it breaks even some stdlib code, and it will
definitely
break many third-party packages and examples. Technically we can do
this, but the benefit is small in comparison with the cost.
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