[3.1.7] SyntaxWarning: invalid escape sequence '\<something>' with Python 3.12

[picca]

Hello, Python3.12 seems to detect malformed strings like this.

I am wondering if these strings should not be marked with r'' in order to avoid interpretation of the escape sequences.

Setting up python3-uncertainties (3.1.7-1.1) ...
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1707: SyntaxWarning: invalid escape sequence '\p'
  'fL': '1234.57 \pm 0.10',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1708: SyntaxWarning: invalid escape sequence '\p'
  'FL': '1234.57 \pm 0.10',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1709: SyntaxWarning: invalid escape sequence '\p'
  'fL': '1234.57 \pm 0.10',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1710: SyntaxWarning: invalid escape sequence '\p'
  'FL': '1234.57 \pm 0.10',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1750: SyntaxWarning: invalid escape sequence '\m'
  'PSL': u'-1.2(\mathrm{nan})×10⁻¹²',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1829: SyntaxWarning: invalid escape sequence '\p'
  'fL': '1234.567890 \pm 0',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1830: SyntaxWarning: invalid escape sequence '\p'
  'FL': '1234.567890 \pm 0',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1995: SyntaxWarning: invalid escape sequence '\i'
  'LS': '-\infty(\infty)',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1996: SyntaxWarning: invalid escape sequence '\i'
  'L': '-\infty \pm \infty',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:1997: SyntaxWarning: invalid escape sequence '\i'
  'LP': u'-\infty±\infty',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:2021: SyntaxWarning: invalid escape sequence '\m'
  'LS': '\mathrm{nan}(\infty)',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:2022: SyntaxWarning: invalid escape sequence '\m'
  'L': '\mathrm{nan} \pm \infty',
/usr/lib/python3/dist-packages/uncertainties/test_uncertainties.py:2023: SyntaxWarning: invalid escape sequence '\m'
  'LP': u'\mathrm{nan}±\infty'

[lebigot]

Indeed:

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. (Contributed by Victor Stinner in gh-98401.)

This should be fixed. I can work on that. In the meantime, anybody's very welcome to do it, but then please leave a note here when you start!

[newville]

@lebigot see #182