Bug#956516: ImportError: cannot import name '_coin' from 'pivy'

[Petr Vanek]

Package: freecad
Version: 0.18.4+dfsg2-1
Followup-For: Bug #956516

It seems that as 0.18.4+dfsg2-1 is built against python3.7, and Debian now 
uses python3.8, that is the cause for the module import error.

This bug is preventing for example export of models from .stp into .obj,
making Freecad unusable, because you cannot export your work anymore.

Thank you

Petr

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.0.0-trunk-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages freecad depends on:
ii  freecad-python3  0.18.4+dfsg2-1

Versions of packages freecad recommends:
ii  calculix-ccx  2.11-1+b3
ii  graphviz      2.42.2-3+b3

Versions of packages freecad suggests:
pn  povray  <none>

-- debconf-show failed