For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next/openSUSE_Tumbleweed/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next.repo
zypper refresh
zypper install python-pygraphviz
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next/15.5/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next.repo
zypper refresh
zypper install python-pygraphviz
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next/15.4/home:PSuarezHernandez:branches:systemsmanagement:saltstack:products:next.repo
zypper refresh
zypper install python-pygraphviz