Bug#1039723: pysolfc does not start any more

[Debian]

Package: pysolfc
Version: 2.6.4-3
Severity: grave

Hello,

trying to start the program after the upgrade from Debian 11 to 12 shows 
on the console this error message:

$ pysolfc
Traceback (most recent call last):
   File "/usr/games/pysolfc", line 36, in <module>
     from pysollib.main import main  # noqa: E402,I202
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/share/games/pysolfc/pysollib/main.py", line 30, in <module>
     from pysollib.app import Application
   File "/usr/share/games/pysolfc/pysollib/app.py", line 32, in <module>
     from pysollib.images import Images, SubsampledImages
   File "/usr/share/games/pysolfc/pysollib/images.py", line 28, in <module>
     from pysollib.pysoltk import copyImage, createBottom, createImage, 
loadImage
   File "/usr/share/games/pysolfc/pysollib/pysoltk.py", line 35, in 
<module>
     from pysollib.tile.tkhtml import *  # noqa: F401,F403
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/share/games/pysolfc/pysollib/tile/tkhtml.py", line 29, in 
<module>
     from pysollib.ui.tktile.tkhtml import Base_HTMLViewer
   File "/usr/share/games/pysolfc/pysollib/ui/tktile/tkhtml.py", line 
24, in <module>
     import formatter
ModuleNotFoundError: No module named 'formatter'


Which package must be installed to get the needed python module into the 
system?

-- System Information:

Debian Release: 12.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'proposed-updates'), (500, 
'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-9-amd64 (SMP w/6 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE 
not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages pysolfc depends on:
ii  python3            3.11.2-1+b1
ii  python3-configobj  5.0.8-1
ii  python3-pygame     2.1.2+dfsg-5+b1
ii  python3-random2    1.0.1-2.1
ii  python3-six        1.16.0-4
ii  python3-tk         3.11.2-3

Versions of packages pysolfc recommends:
ii  python3-pil.imagetk  9.4.0-1.1+b1

Versions of packages pysolfc suggests:
pn  freecell-solver-bin  <none>
pn  pysolfc-cardsets     <none>

-- no debconf information