Installing newer Python on SLES 12

I'm trying to update Python from 3.4.10 to whatever 3.6.x version is available for a SLES 12 SP5 system. 3.6 is no longer supported but sufficient for our needs; something newer is fine if it works on this OS. Suggestions greatly appreciated!

Where are relevant zypper repositories for SLES 12? The main factory now shown is http://download.opensuse.org/repositories/devel:/languages:/python:/Factory/15.4/ but that seems too new.

Is some option available other than using a newer repository with zypper? (I only have SSH access to the machine. And, I'd prefer to avoid building Python from source if possible.)

https://stackoverflow.com/questions/18875165/installing-newest-python-on-opensus seems related but doesn't answer my question because the repositories have changed or been removed.

I attempted to use the commands shown in https://stackoverflow.com/questions/18875165/installing-newest-python-on-opensus but hit problems because the named repository no longer exists.

I then hunted around and found http://download.opensuse.org/repositories/devel:/languages:/python:/Factory/15.4/

Stopped there because that repository doesn't seem relevant.

SLE12-SP5 includes a package named python36, which contains version 3.6.8. It was later updated to version 3.6.15. See the output of zypper search --details --type package python36.