PyQt4: connect

Task: run function mySlotFunction on changing value in combobox:

There is bad idea:
self.connect(self.myComboBox, QtCore.SIGNAL("currentIndexChanged(-1)"), self.
mySlotFunction)  

There is good idea:
self.connect(self.myComboBox, QtCore.SIGNAL("currentIndexChanged(int)"), self.mySlotFunction)