Prefer to use normalised signalslot signatures

New-style Signal and Slot Support — PyQt 4 Reference Guide signal slot The signal-slot mechanism is a way to implement the observer pattern Roughly, the idea is to allow subscription of callback functions to an signal and slot SignalSlot is a pattern that allows loose coupling various components of a software without having to introduce boilerplate code Loose coupling of components

signal slot signal needs to be connected to a method, also known as a slot Slots refer to the method that contains the code to be executed when a signal occurs Almost