This will download an installer, and when you run that file, you’ll be taken through the next steps. Seeing as you want to know how to update Python, chances are high you already have an older ...

The site includes not only Python downloads (available for Windows, OS, and Linux), but also a blog, an event calendar, and a link to the Wiki page.

First, install Python. Open the Python download page and click 'Download Python 3.XXX.XXX'. Double-click the downloaded installer to run it. Check 'Add python.exe to PATH' and click 'Install Now'.