How to make a real-time calculation in a qt table?

Question

Python

Simplified the question for better understanding.
The table has a row of three cells.
It is necessary to show the sum of cells 1 and 2 in cell #3 in real time. those. Similar to excell.
I see a way out, throw an event handler on the cell, if you touch the cell, count the amount and assign it to cell 3.
Maybe there is a built-in feature of qt? Tell me please.

Answer 1

Connect the cell change signal to a slot that will look at what has changed and recalculate, but in general, read "A.