Tkinter StringVar() concatenation
StringVar has a get() method too:
new_data = worksheet._get_cell((element + 1), j).value+"\n"result.set(result.get() + new_data)
StringVar has a get() method too:
new_data = worksheet._get_cell((element + 1), j).value+"\n"result.set(result.get() + new_data)