Program to view what another Program is doing when it is run?

[*RemedY*]

Uuuh, NO!

Python 3 is another language.
Take Python 2.7.x if it is available.
In Python 3 a lot of things changed compared to Python 2 and a great deal of Pythonistas refused switching to Python 3 (so did I). That's why they maintain two branches of the language for a really long period. In the long run everyone should switch to Python 3, but actually I'd measure this period in decades rather than years.

*RemedY*