Now that you have decided to pursue Python, you need to get the tools. To start with you need a decent computer. An ancient brick might run python but it's going to make your life harder. If you are to have only one computer get a laptop. They are cheap these days and very versatile. In an ideal world you would have a laptop and a desktop workstation.
Next up, what operating system to use? Well here you have a lot of flexibility as python supports all major operating systems. Personally I would recommend looking at Ubuntu. Linux has very good open source software and software for programming, and the Ubuntu distro packages it very nicely. To install Ubuntu visit Ubuntu.com and select either the desktop edition http://www.ubuntu.com/desktop/get-ubuntu/download or the laptop edition depending on your needs.
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