For SLE 15 SP6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yudaike:devel-dms-workarounds/SLE_15_SP6/home:yudaike:devel-dms-workarounds.repo
zypper refresh
zypper install python-Cerberus
For SLE 15 SP5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yudaike:devel-dms-workarounds/SLE_15_SP5/home:yudaike:devel-dms-workarounds.repo
zypper refresh
zypper install python-Cerberus
For SLE 15 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yudaike:devel-dms-workarounds/SLE_15_SP4/home:yudaike:devel-dms-workarounds.repo
zypper refresh
zypper install python-Cerberus