Obscurity

Type your comment> @piyadist said:

Hi. I found sss.py file. I read code and i understand RCE. But idk how can i use sss.py. Can you help me?

Read the code carefully and see which function/method used that can be exploited. It’s similar to the way you would with SQLi.
Try to run that code on your own system to practice RCE is also a good idea because you can see the result of your progress.