Resources you may find useful to start with your Python adventure.
- A generic introduction to programming, with an example using PythonAnywhere
- You don’t need to install Python on your machine for your first excercises and experiments. PythonAnywhere is free and completely web based
- Installing Python on Windows is pretty straightforward
- Download Python
- Run the installer and you are good to go
- Installing python on Linux depends on your distribution, anyway here is an interesting article.