import sys
from PySide import QtGui


class MyWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)


        layout = QtGui.QVBoxLayout()
        self.setLayout(layout)

        self.view = QtGui.QListWidget()
        layout.addWidget(self.view)

        b = QtGui.QPushButton('Crash 1', self)
        layout.addWidget(b)
        b.clicked.connect(self.crash1)

        b = QtGui.QPushButton('Crash 2', self)
        layout.addWidget(b)
        b.clicked.connect(self.crash2)

    def crash1(self):
        self.view.addItem('AAA')
        item = self.view.item(0)
        self.view.clear()
        item.text()
        print('OK')

    def crash2(self):
        for i in range(10000):
            self.view.addItem('AAA')
            self.view.item(i)
        self.view.clear()
        QtGui.QWidget(self) # any widget class
        print('OK')


app = QtGui.QApplication(sys.argv)
widget = MyWidget()
widget.show()
sys.exit(app.exec_())