Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/16.0/devel:languages:python:backports.repo
zypper refresh
zypper install python-nbsmoke
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/15.5/devel:languages:python:backports.repo
zypper refresh
zypper install python-nbsmoke
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/15.4/devel:languages:python:backports.repo
zypper refresh
zypper install python-nbsmoke