How can I make an app to be uninstalled half-automatically?

Question

I've plans to create an app. And I thought it could be able to get uninstalled inside the app.

I am using Python.

But I don't know, how I could entirely delete the app.

I know how to delete files and directories using program, but I don't know how I would delete the app entirely without leaving any junk files to the device.

Solution 1:
I could make the program to delete the app, from the app while the app is still running.

Questions for solution 1:
Is it valid to make a program to delete itself?
When program is running does it actually infinitely read the actual file, or does it have a copy somewhere else, which is read by machine?