Python 3 je v RH SW Collections:
https://www.softwarecollections.org/en/scls/rhscl/rh-python35/
jak RH SW collections fungují je popsané tady: https://access.redhat.com/documentation/en-us/red_hat_software_collections/3/html/packaging_guide/
Tady je to popsane lip :) https://developers.redhat.com/products/softwarecollections/overview/