upgrade built-in python to 3.5
I want to upgrade my python in fedora 20 to version 3.5 but after I installed the python.3.5.0.tgz file nothing changed and when I try to use python it still says that it's running the built-in version 2.7.5 How can I change that to the version I want I want to use Django and the version I want is only works on python 3.5
/usr/bin/python is still python2 and should stay that way. You should run /usr/bin/python3 to invoke... whatever version of py3 you've ended up with.
Fedora 23 which should be released end of October, will have Python 3 enabled by default.