For Python 3.5 I'd recommend use of SoftwareCollections.
These are packaged up at an external repo:
On 02/22/2018 02:06 PM, Harsha Purushotham wrote:
I am trying to include Python 3.5.x for custom applications on HELiOS
6.9. I would like to know if Python 3 package RPMs can be downloaded
from Scientific Linux Packages. If yes, what would the link be.
Fermi National Accelerator Laboratory