Go to: https://www.python.org/downloads/

There should be some big yellow text in the center of the page that says "Download the latest version for X" where X is your operating system.
Underneath that is a yellow button. Click it. That will download the latest Python installer.
Go to your downloads folder and double click the installed file. If there's a security warning pop up, click the Run button.
The installer will launch. It should walk you through the rest of the process.
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