pyqt4中创建自定义signal的方法

class SSHThread(QThread):

    def __init__(self, hostname = '', renderList = [], tabLabelText = 'L0001', parent = None):

        """ constructor"""

        ...omit...

        #a new custom signal to set string to textEdit

        self.editSignal = pyqtSignal(QString, QString)

         ...omit...

    def run(self):

          """ emit the new signal"""

          ... omit ...

          self.emit(SIGNAL('editSignal(QString, QString)'), QString("param1"), QString("param2"))

          ... omit ...

...... omit ......

def executeBtn(self):

      """ connect the new signal and a slot function"""

      QObject.connect(self.sshThread, SIGNAL('editSignal(QString, QString)'), self.on_textEdit_update)

      ... omit ...

def on_textEdit_update(self, param1, param2):

       """ the slot function"""

       ... omit ...

================================================

20151223补充一个完整例子，来源：

http:///questions/3891465/how-to-connect-pyqtsignal-between-classes-in-pyqt

from PyQt4 import QtCore

class 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 += 1

class 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()