Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke/openSUSE_Tumbleweed/home:mnhauke.repo
zypper refresh
zypper install python-python-pptx
Для openSUSE Factory ARM запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke/openSUSE_Factory_ARM/home:mnhauke.repo
zypper refresh
zypper install python-python-pptx
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke/15.6/home:mnhauke.repo
zypper refresh
zypper install python-python-pptx