Design pattern 2 persistent window with updates

This is the most common design pattern you'll find in PySimpleGUI.

It's the same across all of the ports of PySimpleGUI. You'll easily be able to recognize a PySimpleGUI program by this basic structure.

This pattern is for windows that remain open with the user interacting with them. It's a "normal" window from a user's standpoint.

This pattern has 4 parts:

1. Layout definition
2. Window creation
3. Event loop - read window events and inputs
4. Window close

Each of these parts is 1 or 2 lines of Python code when working with a basic window. The size of the event loop depends on the amount of processing you need to do when events happen in the window.