root@crowned-delena:~# apt-get install python3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3 is already the newest version.
The following packages were automatically installed and are no longer required:
  libfreetype6 os-prober
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@crowned-delena:~# python --version
Python 2.7.6
root@crowned-delena:~# python3 --version
Python 3.4.3