Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:zippy:jx:packages-ready/15.6/home:zippy:jx:packages-ready.repo
zypper refresh
zypper install python-rpm
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:zippy:jx:packages-ready/15.5/home:zippy:jx:packages-ready.repo
zypper refresh
zypper install python-rpm
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:zippy:jx:packages-ready/15.4/home:zippy:jx:packages-ready.repo
zypper refresh
zypper install python-rpm