This deprecation warning appears with Python 3.9:

/usr/lib/python3/dist-packages/mistune.py:435: DeprecationWarning: invalid escape sequence \|
    cells[i][c] = re.sub('\\\\\|', '|', cell)

I'm not sure what is intended here; perhaps
    cells[i][c] = re.sub(r'\|', '|', cell)

Best wishes,

   Julian

Ah, no, that makes no sense.  I think there's just a missing backslash
in the first, so the correct line should be

     cells[i][c] = re.sub('\\\\\\|', '|', cell)

or more readably:

     cells[i][c] = re.sub(r'\\\|', '|', cell)

Of course a simpler solution is

     cells[i][c] = cell.replace(r'\|', '|')

Best wishes,

   Julian

Hi,

I just compiled the package (which includes running tests) with Python
version 3.9.9, and the only deprecation warning was about using
"setup.py install" ; can you tell me more about how to reproduce?

Thanks,

J.Puydt

Hi,

since it's just a warning and I can't reproduce it since more than a
year: closing.

Cheers,

J.Puydt

Hi Julien,

I'm sorry - I never saw this message (you forgot to copy in
nnn-submitter@b.d.o), so I never replied.

This deprecation warning appeared when running pytest on another
package (I don't recall which one offhand, unfortunately), and it's in
reference to an invalid regular expression as described in the bug
report.  To obtain the deprecation warning, one probably needs to
execute the relevant piece of code.

I've just reopened and reassigned the bug to python3-mistune0, as it
does not appear in the mistune v2 rewrite.  Eventually that package
may disappear, and this bug report with it.  But I think python 3.10
or 3.11 will turn this deprecation warning into an error, at which
point some things may break if python3-mistune0 has not been
deprecated by then.

Best wishes,

   Julian

As can be seen in pipuarts [1], this is now a SyntaxWarning with
Python 3.12, and will become a SyntaxError in future.


[1] https://piuparts.debian.org/sid/source/m/mistune0.html


  Setting up python3-mistune0 (0.8.4-4) ...
  /usr/lib/python3/dist-packages/mistune0.py:435: SyntaxWarning:
invalid escape sequence '\|'
    cells[i][c] = re.sub('\\\\\|', '|', cell)

We believe that the bug you reported is fixed in the latest version of
mistune0, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 979225@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Alexandre Detiste <tchet@debian.org> (supplier of updated mistune0 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 06 Sep 2025 13:53:14 +0200
Source: mistune0
Architecture: source
Version: 0.8.4-5
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Alexandre Detiste <tchet@debian.org>
Closes: 979225 1114208
Changes:
 mistune0 (0.8.4-5) unstable; urgency=medium
 .
   * Team upload.
   * Fix compatibility with Pytest 8.4 (Closes: #1114208)
   * Fix SyntaxWarning (Closes: #979225)
   * Use dh-sequence-python3
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