wget --no-check-certificate https://www.python.org/ftp/python/2.7.11/Python-2.7.11.tgz
tar -xzf Python-2.7.11.tgz
cd Python-2.7.11
Now read the README file to figure out how to install, or do the following with no guarantees from me that it will be exactly what you need.
./configure
make
sudo make install
For Python 3.5 use the following download address:
http://www.python.org/ftp/python/3.5.1/Python-3.5.1.tgz
For other versions and the most up to date download links:
http://www.python.org/getit/