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**Design Pattern 2 - Persistent Windows, output updates in window**
***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.
<iframe src='https://trinket.io/embed/pygame/c0bf3a6754?start=result' width='100%' height='500' frameborder='0' marginwidth='0' marginheight='0' allowfullscreen></iframe>