Python 3.3 installation issues with scitools

[hoboy]

I want to use http://code.google.com/p/scitools/
but when I follow the installation guide for ubuntu here :http://code.google.com/p/scitools/wiki/Installation
I get the following errors:
---------------------------------------------------------------------------------------------------------------------------------------
Fetched 1,551 kB in 11s (137 kB/s)
W: Failed to fetch http://ppa.launchpad.net/scitools/ppa/ubuntu/dists/quantal/main/source/Sources 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/scitools/ppa/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/scitools/ppa/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
-----------------------------------------------------------------------------------------------------------------------------------------
Then I follwoed this :
http://askubuntu.com/questions/244544/how-to-install-python-3-3
then done this to have python3.3 :Here is what I did to install Python 3.3 on Ubuntu 12.04:
-----------------------------------------------------------------------------------------------------------------------
when I use python --version
I get
Python 2.7.3
how can set python3.3 as default python.

Tks