SyntaxWarnings with Python3.12

@zdohnal, thanks a lot for the patch, I have applied it now (with slight adjustments) to the Ubuntu package, fixing bug #2054869.

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Till,

in case there is an issue within my patch which made you do the adjustments, would you mind sharing them here? Upstream can apply them later together with all changes.

This is the patch adapted to the actual Ubuntu/Debian package of HPLIP, as used in the hplip 3.23.12+dfsg0-0ubuntu2 release for Noble.

The adaptations were most probably needed because, before applying this patch ~80 other patches got applied to the original source code of HPLIP.

Especially the transition from "is not" to "!=" seems already done.

This bug was fixed in the package hplip - 3.23.12+dfsg0-0ubuntu4

---------------
hplip (3.23.12+dfsg0-0ubuntu4) noble; urgency=medium

  * Fix FTBFS on armhf due to implicit functions

 -- Simon Chopin <email address hidden> Fri, 22 Mar 2024 15:40:13 +0100

I'm sorry but the related fix seem to be not complete: during upgrade from 23.10.1 mantic to 24.04 noble it updates hplip-data 3.23.12+dfsg0-0ubuntu5 from previous 3.22.10+dfsg0-2ubuntu1 and it doesn't generate SyntaxWarnings... but a few moments later, then during python3 (3.12.3-0ubuntu1) configuration:

Configurando python3 (3.12.3-0ubuntu1) ...
running python rtupdate hooks for python3.12...
...
/usr/share/hplip/base/imagesize.py:186: SyntaxWarning: invalid escape sequence '\#'
  re.compile('\#define\s+\S+\s+\d+') : ('image/x-xbitmap', xbmsize),
/usr/share/hplip/base/imagesize.py:187: SyntaxWarning: invalid escape sequence '\/'
  re.compile('\/\* XPM \*\/') : ('image/x-xpixmap', xpmsize),
/usr/share/hplip/base/imagesize.py:189: SyntaxWarning: invalid escape sequence '\*'
  re.compile('^II\*\x00') : ('image/tiff', tiffsize),
/usr/share/hplip/fax/ledmfax.py:46: SyntaxWarning: invalid escape sequence '\d'
  http_result_pat = re.compile(b"""HTTP/\d.\d\s(\d+)""", re.I)
...
running python post-rtupdate hooks for python3.12...

You can also reinstall hplip-data using apt and ending in the same problem:

# apt install --reinstall hplip-data
Leyendo lista de paquetes... Hecho
Creando árbol de dependencias... Hecho
Leyendo la información de estado... Hecho
0 actualizados, 0 nuevos se instalarán, 1 reinstalados, 0 para eliminar y 0 no actualizados.
Se necesita descargar 6.467 kB de archivos.
Se utilizarán 0 B de espacio de disco adicional después de esta operación.
Des:1 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 hplip-data all 3.23.12+dfsg0-0ubuntu5 [6.467 kB]
Descargados 6.467 kB en 1s (8.035 kB/s)
(Leyendo la base de datos ... 221724 ficheros o directorios instalados actualmente.)
Preparando para desempaquetar .../hplip-data_3.23.12+dfsg0-0ubuntu5_all.deb ...
Desempaquetando hplip-data (3.23.12+dfsg0-0ubuntu5) sobre (3.23.12+dfsg0-0ubuntu5) ...
Configurando hplip-data (3.23.12+dfsg0-0ubuntu5) ...
/usr/share/hplip/base/imagesize.py:186: SyntaxWarning: invalid escape sequence '\#'
  re.compile('\#define\s+\S+\s+\d+') : ('image/x-xbitmap', xbmsize),
/usr/share/hplip/base/imagesize.py:187: SyntaxWarning: invalid escape sequence '\/'
  re.compile('\/\* XPM \*\/') : ('image/x-xpixmap', xpmsize),
/usr/share/hplip/base/imagesize.py:189: SyntaxWarning: invalid escape sequence '\*'
  re.compile('^II\*\x00') : ('image/tiff', tiffsize),
/usr/share/hplip/fax/ledmfax.py:46: SyntaxWarning: invalid escape sequence '\d'
  http_result_pat = re.compile(b"""HTTP/\d.\d\s(\d+)""", re.I)