For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:catsfood:devel/openSUSE_Tumbleweed/home:catsfood:devel.repo
zypper refresh
zypper install python-rst2pdf
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:catsfood:devel/16.0/home:catsfood:devel.repo
zypper refresh
zypper install python-rst2pdf
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:catsfood:devel/15.6/home:catsfood:devel.repo
zypper refresh
zypper install python-rst2pdf