python-ply from Cloud:OpenStack:Upstream:Queens:SLE_12_SP3 project

For SLE 12 SP3 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/Cloud:OpenStack:Upstream:Queens:SLE_12_SP3/SLE_12_SP3/Cloud:OpenStack:Upstream:Queens:SLE_12_SP3.repo
zypper refresh
zypper install python-ply