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| author | Victor Stinner <vstinner@python.org> | 2022-11-03 16:53:25 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-11-03 16:53:25 (GMT) |
| commit | a60ddd31be7ff96a8189e7483bf1eb2071d2bddf (patch) | |
| tree | 61eacd702c4ecec19d1b7a4133e2916be9c955e4 /Doc/whatsnew | |
| parent | 916af11a976ca2faf0a8a77b0aaf71893e549cfe (diff) | |
| download | cpython-a60ddd31be7ff96a8189e7483bf1eb2071d2bddf.zip cpython-a60ddd31be7ff96a8189e7483bf1eb2071d2bddf.tar.gz cpython-a60ddd31be7ff96a8189e7483bf1eb2071d2bddf.tar.bz2 | |
gh-98401: Invalid escape sequences emits SyntaxWarning (#99011)
A backslash-character pair that is not a valid escape sequence now
generates a SyntaxWarning, instead of DeprecationWarning. For
example, re.compile("\d+\.\d+") now emits a SyntaxWarning ("\d" is an
invalid escape sequence), use raw strings for regular expression:
re.compile(r"\d+\.\d+"). In a future Python version, SyntaxError will
eventually be raised, instead of SyntaxWarning.
Octal escapes with value larger than 0o377 (ex: "\477"), deprecated
in Python 3.11, now produce a SyntaxWarning, instead of
DeprecationWarning. In a future Python version they will be
eventually a SyntaxError.
codecs.escape_decode() and codecs.unicode_escape_decode() are left
unchanged: they still emit DeprecationWarning.
* The parser only emits SyntaxWarning for Python 3.12 (feature
version), and still emits DeprecationWarning on older Python
versions.
* Fix SyntaxWarning by using raw strings in Tools/c-analyzer/ and
wasm_build.py.
Diffstat (limited to 'Doc/whatsnew')
| -rw-r--r-- | Doc/whatsnew/3.12.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst index a943256..73c124d 100644 --- a/Doc/whatsnew/3.12.rst +++ b/Doc/whatsnew/3.12.rst @@ -121,6 +121,22 @@ Other Language Changes chance to execute the GC periodically. (Contributed by Pablo Galindo in :gh:`97922`.) +* A backslash-character pair that is not a valid escape sequence now generates + a :exc:`SyntaxWarning`, instead of :exc:`DeprecationWarning`. + For example, ``re.compile("\d+\.\d+")`` now emits a :exc:`SyntaxWarning` + (``"\d"`` is an invalid escape sequence), use raw strings for regular + expression: ``re.compile(r"\d+\.\d+")``. + In a future Python version, :exc:`SyntaxError` will eventually be raised, + instead of :exc:`SyntaxWarning`. + (Contributed by Victor Stinner in :gh:`98401`.) + +* Octal escapes with value larger than ``0o377`` (ex: ``"\477"``), deprecated + in Python 3.11, now produce a :exc:`SyntaxWarning`, instead of + :exc:`DeprecationWarning`. + In a future Python version they will be eventually a :exc:`SyntaxError`. + (Contributed by Victor Stinner in :gh:`98401`.) + + New Modules =========== |