How to connect pyqtSignal between classes in PyQT

Question

Hello. I'd like to ask you for an advice. How to connect pyqtSignal between two different objects (classes) PROPERLY? I mean best practice. Look what I have done to achieve the goal: The Thermometer class is notified when Pot increases its temperature:

from PyQt4 import QtCore

class Pot(QtCore.QObject):
    temperatureRaisedSignal = QtCore.pyqtSignal()
    def __init__(self, parent=None):
        super(Pot, self).__init__(parent)
        self.temperature = 1
    def Boil(self):
        self.temperature += 1
        self.temperatureRaisedSignal.emit()
    def RegisterSignal(self, obj):
        self.temperatureRaisedSignal.connect(obj)

class Thermometer():
    def __init__(self, pot):
        self.pot = pot
        self.pot.RegisterSignal(self.temperatureWarning)
    def StartMeasure(self):
        self.pot.Boil()
    def temperatureWarning(self):
        print("Too high temperature!")

if __name__ == '__main__':
    pot = Pot()
    th = Thermometer(pot)
    th.StartMeasure()

Or is there any easier / better way to do it? I also insist (if possible) on using "new" style PyQt signal. I couldn't find any real example. Thank you.