Bug#1061802: Did Python 3.12 developers honestly broke special regexp sequences? (Was: hatop fails its autopkg tests with Python 3.12)

[Stéphane Blondon]

Hello Andreas,

On 13/02/2024 18:21, Andreas Tille wrote:

I was constantly shaking my had above bug #1061802 featuring
Syntaxwarnings like

SyntaxWarning: invalid escape sequence '\.'
573s   CLI_INPUT_RE = re.compile('[a-zA-Z0-9_:\.\-\+; /#%]')
573s /tmp/autopkgtest.G4v4eK/autopkgtest_tmp/hatop.py:215:
SyntaxWarning: invalid escape sequence '\s'
573s   'software_name':    re.compile('^Name:\s*(?P<value>\S+)'),

The source code should be:
'software_name':    re.compile(r'^Name:\s*(?P<value>\S+)'),


The fix comes from the second point in:
https://docs.python.org/3/whatsnew/3.12.html#other-language-changes



--
Stéphane

Python 3.12 added some SyntaxWarning when there is invalid sequences in a string. (If I remember correctly, it has already happened in the past.) It's a warning so the code should work properly. If a string contains 'invalid sequences' (like regexp), you can declare it as raw string: they are prefixed with an 'r' character.

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