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Python Versions on Mac

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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?