I'm looking for a linux distro that has the following:

  1. Be as light as possible. I won't be using it as my main OS, it's just for testing purposes.
  2. Can be loaded in Virtual Box without installing (Dream Studio allowed this).
  3. Have a UI and automaticaly plugs a USB drive. I had a bad experience mounting/unmounting drives in Ubuntu Server.
  4. Supports python 2/3.
  5. Allows me to write/test my programs.

If you know any that fits my purposes please let me know.
Thanks in advance.