[Python-Dev] PEG parser and raw strings

2020-05-28 Thread Vito De Tullio 
Hi.
Just a question about the new PEG parser: will it support lone slash in 
raw strings?

the fact that r'\' doesn't work as expected it's a strange exception to 
remember.

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[Python-Dev] Re: PEG parser and raw strings

2020-05-28 Thread Guido van Rossum 
That's the business of the tokenizer, not the parser. And no, nothing is
changing there. Please start a discussion on this topic here -- use
python-ideas if you feel the need to vent.

On Thu, May 28, 2020 at 1:20 PM Vito De Tullio 
wrote:

> Hi.
> Just a question about the new PEG parser: will it support lone slash in
> raw strings?
>
> the fact that r'\' doesn't work as expected it's a strange exception to
> remember.
>
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> Python-Dev mailing list -- [email protected]
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> https://mail.python.org/mailman3/lists/python-dev.python.org/
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> https://mail.python.org/archives/list/[email protected]/message/VSEB5O33WTNHBAJ63MC2WMZ772GJNMJC/
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>


-- 
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun here?)*

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[Python-Dev] Re: PEG parser and raw strings

2020-05-28 Thread Terry Reedy 

On 5/28/2020 3:26 PM, Vito De Tullio wrote:

Just a question about the new PEG parser: will it support lone slash in
raw strings?


In 3.9, the new parser is intended to be a drop-in replacement.  That is 
still being worked on.  For 3.10, user-visible changes can be 
considered, but I have not seen any concrete proposals.



the fact that r'\' doesn't work as expected it's a strange exception to
remember.


That said, this seems like a scanner, not a compiler issue.
>>> print(repr(r'\'))
SyntaxError: EOL while scanning string literal

The python syntax highlighter marks all of "r'\')) as part of the 
string, ... but

>>> exec(compile("print(repr(r'\'))", '', 'exec'))
''

--
Terry Jan Reedy
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[Python-Dev] Re: PEG parser and raw strings

2020-05-28 Thread Greg Ewing 

On 29/05/20 7:26 am, Vito De Tullio wrote:

Hi.
Just a question about the new PEG parser: will it support lone slash in
raw strings?


Even if it could be made to, it presumably won't, because that
would be a language change (e.g. the meaning of r'foo\'bar'
would change).

In any case, this is a function of the tokeniser, which I
understand isn't being replaced at this stage.

--
Greg
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