The PEP does say `should' and that a future PEP will require the python command to be Python 3.x. Given a default Fedora install does not have the python comma

The PEP does say `should' and that a future PEP will require the python command to be Python 3.x. Given a default Fedora install does not have the python command but does have python3, I'd say it's 3.x by default.