For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie:python/openSUSE_Tumbleweed/home:Simmphonie:python.repo
zypper refresh
zypper install python-setuptools_scm_git_archive
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie:python/15.5/home:Simmphonie:python.repo
zypper refresh
zypper install python-setuptools_scm_git_archive
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie:python/15.4/home:Simmphonie:python.repo
zypper refresh
zypper install python-setuptools_scm_git_archive