Question

In my program, function add_host runs when the program launches and at the same time I want the first row of the table to be clicked. How to do that, any idea?.

Answer 1

With your QTableWidget as tw, you simply need to call

tw.cellClicked.emit(row, column)

or

tw.itemClicked.emit(tw.item(row, column))

In your case where you want the first row to be clicked you would probably have row = 0 and column = 0.