#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys
from PySide import QtGui, QtCore

class Example(QtGui.QWidget):   
    def __init__(self):
        super(Example, self).__init__()
        sld = QtGui.QSlider(QtCore.Qt.Horizontal, self)

        vbox = QtGui.QVBoxLayout()
        vbox.addWidget(sld)

        self.setLayout(vbox)
        sld.valueChanged.connect(self.exampleFail)
        
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Signal & slot')
        self.show()

        #Delete this bad boy
        sld.deleteLater()

        #Setup to fail
        QtCore.QTimer.singleShot (2000, self.exampleFail)

        #Keep a reference for us to use later around
        self.newref = sld

    def exampleFail(self):
        #The following causes a nice exception
        #self.newref.value()

        #The following causes a segfault
        self.newref.valueChanged.disconnect(self.exampleFail)
        
def main():    
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()