Yes, there are wrapper scripts on my system.  My system was updated from 3.3 to 3.6.  The 3.3 and 3.6 wrappers are equivalent and similar to the python2.7 wrapper as shown:  

exec -a `dirname $realpath`/python2.7 `dirname $realpath`/python2.7.real "$@"
exec /usr/bin/scl enable python33 -- python "$@"
exec /usr/bin/scl enable rh-python36 -- python "$@"

This has to be something specific to the rh-python36 package or python36-scl that replaced python33 on my system.  Since Benjamin could not reproduce with 3.6.3 my bet that it is an in-house, self-inflicted problem.

Thank you.  I am closing this one as "not a bug" in python 3.6.