Trying to understand signals and slots.
Have looked at many examples, but can not find how to incorporate them into my working program.
The following code is meant to take a changed value from a combo box, and enter it in an LCD.
The program runs without error, but the LCD is not activated.
What do I have to change to get it to work?

Thanks,
Don

Qt Code: 
  1. def createTopRightGroupBox(self):
  2.         self.topRightGroupBox = QtGui.QGroupBox("Top Right")
  3.  
  4.         labelVolts = QtGui.QLabel("Volts/Div")
  5.         labelVolts.setAlignment(QtCore.Qt.AlignHCenter)
  6.  
  7.         comboVolts = QtGui.QComboBox()
  8.         volts = ['2.5', '5.0', '10.0', '20.0']
  9.         comboVolts.addItems(volts)
  10.  
  11.         lcdVolts = QtGui.QLCDNumber()
  12.  
  13.         layout = QtGui.QVBoxLayout()
  14.         layout.addWidget(labelVolts)
  15.         layout.addWidget(comboVolts)
  16.         layout.addWidget(lcdVolts)                 
  17.         layout.addStretch(1)
  18.         self.topRightGroupBox.setLayout(layout)
  19.  
  20. # process signal
  21.         self.connect(comboVolts, QtCore.SIGNAL('valueChanged'), self.changeValue)   
  22.  
  23.     def changeValue(self, event):
  24.         volts = self.comboVolts.value()
  25.         self.lcdVolts.display(volts)
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