how to install python3.3 completely and remove python2.7 on Ubuntu12.04?
Question: I have installed python3.3 with commands:

    
    
    sudo apt-get install python-software-properties
    sudo add-apt-repository ppa:fkrull/deadsnakes
    sudo apt-get update
    sudo apt-get install python3.3
    

It works,but python2.7 installed in ubuntu by default still exiet.When I type
"python",it show me the interactive shell of python2.7. I can use python3.3 by
type "python3.3",but i can't import some library,such as gtk,Qt.but it works
in 2.7.

Now I want to remove python2.7,it show me that it will free 247M,which beyond
my expection.If I did it,any important library would be removed togeter?

How to use the Qt library with python3.3 instead of 2.7?

Thank you for answering!


Answer: Completely removing python 2.7 is not the best option, as it is default python
version for ubuntu and you might end breaking some python-dependent utilities
and programs.

Consider using virtual environment manager for different libraries management.
I use [pyenv](https://github.com/yyuu/pyenv) for python versions management
and [virtualenvwrapper](http://virtualenvwrapper.readthedocs.org/en/latest/)
for python packages management.

For example running

    
    
    export PATH=/path/to/python3
    source /usr/local/bin/virtualenvwrapper.sh
    mkvirtualenv test --no-site-packages
    

will make a clean virtual environment for you, where you can install any
needed packages, sucha as `Qt`.

