To start writing and executing Python code, you need to install a Python interpreter on your computer. Two major versions of Python are currently used: 2.x.x and 3.x.x. In this course we will be using 3.7.3, a recent version of Python.

Python is supported on all major operating systems such as Windows, MacOs and Linux. 

A different installer is packaged for each operating system. For Windows, go to https://www.python.org/downloads/windows/ and download the 3.x.x installer you desire and follow the guided installation steps.

On Mac, go to https://www.python.org/downloads/mac-osx/ and downlaod the right release or version and follow the guided installation steps.

On Linux OS such as Ubuntu, Python may be installed via the command line interface or terminal. Run these coomands in order to get Python installed:

$ sudo apt-get update
$ sudo apt-get install python3.x.x

Remember to replace x.x with your desired Python version number.