For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:ERP:Tryton:6.0/openSUSE_Tumbleweed/Application:ERP:Tryton:6.0.repo
zypper refresh
zypper install python-packaging
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:ERP:Tryton:6.0/15.6/Application:ERP:Tryton:6.0.repo
zypper refresh
zypper install python-packaging
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:ERP:Tryton:6.0/15.5/Application:ERP:Tryton:6.0.repo
zypper refresh
zypper install python-packaging