Python Forum

I'm trying to create a flowchart in the wxpython library, but I have no idea what commands to use.
I am not able to define a rectangle and associate it with text, change the border of the rectangle and paint the rectangle.
Thank you.

download the demo program here: https://github.com/wxWidgets/Phoenix/
you will find a beautiful demo that has 2 tabs for each widget, a demo, and source code
you can run the demo with python demo/demo.py

Your question is a bit vague.
You can look at DOT graph description language and there python package graphviz
look also at See also section, e.g. other packages are pydot, pygraphviz, etc.
There is also open source graph visualization software - https://www.graphviz.org/ (also required to render the graph)