如何在PyQT中的类之间连接pyqtSignal

from PyQt4 import QtCoreclass Pot(QtCore.QObject):    temperatureRaisedSignal = QtCore.pyqtSignal()    def __init__(self, parent=None):        QtCore.QObject.__init__(self)        self.temperature = 1    def Boil(self):        self.temperatureRaisedSignal.emit()        self.temperature += 1class Thermometer():    def __init__(self, pot):        self.pot = pot        self.pot.temperatureRaisedSignal.connect(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()

根据文档，这就是我的做法：http

//www.riverbankcomputing.com/static/Docs/PyQt4/html/new_style_signals_slots.html