Comments (3)
That has nothing to be with PEP 701. PEP 701 is about f-strings, not about strings in general. That change was introduced here:
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The referenced commit is about octal sequences above 0o377. The warning results from changing the invalid escape sequence warning from DeprecationWarning (usually invisible) to SyntaxWarning (usually visible, but not currently in IDLE and other possible circumstances) in 3.12 in issue #98401, PR #99011. The same warning occurs with '\.a'
and '\.'
.
The change was in 3.12.0 and noted in What' New 3.12:
A backslash-character pair that is not a valid escape sequence now generates a SyntaxWarning, instead of DeprecationWarning.
If you want a single backslash in the string, either double it or precede the string with 'r': '\\.00' == r'\.00'
is True
.
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