Support for Signals and Slots — PyQt Reference Guide

Adding signals to custom QML types; Connecting signals to methods and signals; Signal to signal connect Signal parameters Signals might have parameters

Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time

qtech slot To send signal across threads we have to use the parameter Without this parameter the code will be executed in the same

qt slot signal Hi, you need to add the parameters in the signal when you call connect, but you can omit them in the slot, so you don't need a dummy parameter