Simple operation: 2 + 2 Why does not work??

Question

https://code.sololearn.com/284/#py

Why this does not work?

Thx, I am soooo new at this.

Answer 1

This question is duplicated. Please delete it.
https://www.sololearn.com/discuss/2248012/?ref=app

Answer 2

It should work.. Where is the file from..?
May be older vertion..

Edit : it is not python file..
Showing Swift file..