I want to make a program in which you can edit pictures or similar to paint in windows.

Does anyone have any idea how?

You can download one here, called pydrawing, which claims to draw diagrams in a tkinter canvas.

Python and tkinter have been around for 20 years, which means many attempts to write paint programs. There is a basic example in Mark Lutz' book 'programming python'.

The first step in your project is to crawl the web ;)

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