Python Versions on Mac

Question

I'm working on Mac Os 10.7 (Lion) and I have some questions:

1. What is the pre-installed version of python on Lion?
2. I've been working on this computer for some time now, and i've installed lots of software in order to do college work many times I didn't know what I was really doing. The thing is: now I hava on the /Library/Frameworks/Python.framework/Versions/ a folder called "7.0" I'm pretty sure there no python version 7. Is this folder native or a third-part program installation. Can I delete it? (it's using 1 Gb on disk).
3. Where is located the original python that comes with mac os?
4. I've choose Homebrew as my package manager, is there a easy way to manage python versions with it?

Solution

1. I think that is Python 2.7 but you can check typing python on a command terminal. It will tell you the version.
2. I couldn't tell that you can deleting it, because I don't know what it has... can you give more info about it?
3. Just type "which python" and it will tell you
4. You should use virtualenv and pip: http://jontourage.com/2011/02/09/virtualenv-pip-basics/