from PyQt4 import QtGui, QtCore
class SlotSignalTest(QtGui.QLabel):
    clicked = QtCore.pyqtSignal()
    def __init__(self, parent = None):
        QtGui.QLabel.__init__(self, parent = parent)
        self.setText('signal test')
        self.clicked.connect(self.printMsg)
    def printMsg(self):
        print 'mouse moved'
    def mouseMoveEvent(self, event):
        self.clicked.emit()
        return super(SlotSignalTest, self).mouseMoveEvent(event)
if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    win = QtGui.QMainWindow()
    win.setCentralWidget(SlotSignalTest())
    win.show()
    sys.exit(app.exec_())