Description

pablogsal

opened on Jun 14, 2023

Issue body actions

In 3.12 and 3.13, f-strings are not warning about invalid escapes that get warnings in real strings. This seems like a bug.

>>> f'\?'
'\\?'
>>> len(f'\?')
2
>>> '\?'
<stdin>:1: SyntaxWarning: invalid escape sequence '\?'
'\\?'

_Originally posted by @terryjreedy in https://github.com/python/cpython/issues/105784#issuecomment-1591828755_
            

<!-- gh-linked-prs -->
### Linked PRs
* gh-105801
* gh-105806
<!-- /gh-linked-prs -->

Reacted by Terry Jan Reedy

Activity

1. pablogsal

   added a commit that references this issue on Jun 14, 2023

   pythongh-105800: Issue SyntaxWarning in f-strings for invalid escape …

   8a4b38e
2. AlexWaygood

   added

   3.12only security fixesonly security fixes

   3.13only security fixesonly security fixes

   on Jun 14, 2023
3. miss-islington

   added a commit that references this issue on Jun 15, 2023

   pythongh-105800: Issue SyntaxWarning in f-strings for invalid escape …

   e3a46f8
4. pablogsal

   added a commit that references this issue on Jun 15, 2023

   gh-105800: Issue SyntaxWarning in f-strings for invalid escape sequen…

   12b6d84
5. pablogsal commented on Jun 15, 2023

   

   pablogsal

   on Jun 15, 2023

   MemberAuthor

   More actions

   CC: @terryjreedy
6. pablogsal

   closed this as completedon Jun 15, 2023
7. pablogsal

   changed the title [-]f-strings are not warning about invalid escapes[/-] [+]f-strings do not warning about invalid escapes[/+] on Jun 15, 2023
8. pablogsal

   changed the title [-]f-strings do not warning about invalid escapes[/-] [+]f-strings do not show warnings about invalid escapes[/+] on Jun 15, 2023
9. pablogsal

   added a commit that references this issue on Jun 15, 2023

   [3.12] gh-105800: Issue SyntaxWarning in f-strings for invalid escape…

   638c2ba
10. carljm

    added a commit that references this issue on Jun 15, 2023

    Merge branch 'main' into modulelocals

    166aca9

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