How did they get the calculator in Python? Is it an emulator? Maybe you meant to say it the other way around.

I think the point is that anything the calculator can do, Python can do (and more obviously). Perhaps with a bit more difficulty, at least in the Termux case.

Maybe using iPython (or even jupyter) could be useful here.

I think he just means it comes with all the functions of the calculator, that there's nothing the calculator can do that python can't