I am face a problem that took me a lot of time and I do not resolve it yet, the problem is how does modelisation look like with Petri nets for an application writen in python? and if there are any exemple of couple of code and Petri nets representation(modelisation) please show me, so thank's for all of you.
I know that Petri nets compose of arrows, states(places) and transitions(events)
You cannot just translate any random program - no matter what language - into a Petri net model. Models are abstractions, so you have to decide which states of your program are important enough to become part of the model. Then you have to figure out how to represent these states with tokens in places. Then you have to figure out how to describe the state changes with transitions.
Does this sound all too vague to you? That's because your question is too broad. Your Python application could be a text editor, an HTTP server, a particle simulator, a chess game. We cannot help you to create a model without knowing what you're trying to model.