Python-3.4 was recently unmasked and this has resulted in it being installed on Funtoo Linux systems. It is currently part of stage3's.
There is nothing wrong with Python 3.4 -- but we are going to mask 3.4. The reason is because right now, we have 3 versions of python on a stage3 -- 2.7, 3.3 and 3.4. And I don't feel it's the right time to "switch" to 3.4. 3.4 is fine to use, and if you want to continue to use it, you should unmask it locally and set PYTHON_ABIS in /etc/make.conf to something like "2.7 3.3 3.4" (containing the versions of python that you want Portage to build modules for.)
We are going to be sticking with 2.7 and 3.3 for a while, our official versions of python, and will officially switch to 3.4+ at some point in the future. At this time, we'll update our official PYTHON_ABIS setting in our profile, which tells Portage what versions of python it should build python modules for, and deprecate 3.3, which will not be installed by default.
Just letting you know so you're aware of upoming changes to your Funtoo systems.
This work is being tracked in this bug: