[PyQt] Getting a segfault when I close my program

[dizou]

This code will recreate the problem:

Main.py:
#!/usr/bin/env python
import sys
from PyQt4 import QtGui
from MainWindow import *

app = QtGui.QApplication(sys.argv)
    
widget = MainWindow()
widget.resize(250, 150)
widget.show()

sys.exit(app.exec_())

MainWindow.py:
#!/usr/bin/env python

from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtCore import SIGNAL, SLOT, QDir, QFile
from PyQt4.QtGui import QApplication, QMainWindow, QMenu, QMessageBox, \
     QWidget, qApp, QAction, QFileDialog, QPushButton
from MainWidget import *

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        
        self.main = MainWidget()
        
        #print dir(MainWidget)
        #print self.__dict__
        #self.CreateActions()
        #self.CreateMenus()
        
        self.setCentralWidget(self.main)
        
        self.statusBar = self.statusBar()

MainWidget.py:
#!/usr/bin/env python

import math
from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtCore import SIGNAL, SLOT, QDir, QFile
from PyQt4.QtGui import QApplication, QMenu, QMessageBox, \
     QWidget, qApp, QAction, QFileDialog, QPushButton, QGraphicsItem

class MainWidget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        
        self.tree = QTreeWidget(self)
        self.display = QGraphicsScene(self)
        self.view = QGraphicsView(self.display)
        self.view.show()
        
        self.newButton = QToolButton()
        self.openButton = QToolButton()
        self.saveButton = QToolButton()
        self.addButton = QToolButton()
        self.deleteButton = QToolButton()
        self.editButton = QToolButton()
        self.copyButton = QToolButton()
        self.pasteButton = QToolButton()
        
        self.viewParentButton = QToolButton()
        self.viewChildrenButton = QToolButton()
        self.view3DButton = QToolButton()
        
        self.playButton = QToolButton()
        self.stopButton = QToolButton()
        self.stepForwardButton = QToolButton()
        self.stepBackwardButton = QToolButton()
        self.updateButton = QToolButton()
        
        self.stepLabel = QLabel("Movement Index:")
        self.stepLineEdit = QLineEdit()
        self.stepSizeLabel = QLabel("Movement Step Size:")
        self.stepSizeSlider = QSlider(Qt.Horizontal)
        self.stepSizeLineEdit = QLineEdit()
        self.rightSpacer = QSpacerItem(10, 0, QSizePolicy.Expanding)

        self.newButton.setToolTip("New")
        self.openButton.setToolTip("Open")
        self.saveButton.setToolTip("Save")
        self.addButton.setToolTip("Add Element")
        self.deleteButton.setToolTip("Delete Element")
        self.editButton.setToolTip("Edit Element")
        self.copyButton.setToolTip("Copy Element")
        self.pasteButton.setToolTip("Paste Element")
        
        self.viewParentButton.setToolTip("View Parent Element")
        self.viewChildrenButton.setToolTip("View Child Element")
        self.view3DButton.setToolTip("3D View")
        
        self.playButton.setToolTip("Play")
        self.stopButton.setToolTip("Stop")
        self.stepForwardButton.setToolTip("Step Forward")
        self.stepBackwardButton.setToolTip("Step Backward")
        self.updateButton.setToolTip("Update")
        
        treeControlLayout = QGridLayout()
        treeControlLayout.addWidget(self.newButton, 0, 0)
        treeControlLayout.addWidget(self.openButton, 0, 1)
        treeControlLayout.addWidget(self.saveButton, 0, 2)
        treeControlLayout.addWidget(self.addButton, 0, 3)
        treeControlLayout.addWidget(self.deleteButton, 0, 4)
        treeControlLayout.addWidget(self.editButton, 0, 5)
        treeControlLayout.addWidget(self.copyButton, 0, 6)
        treeControlLayout.addWidget(self.pasteButton, 0, 7)
        treeControlLayout.addItem(self.rightSpacer, 0, 8)
        
        viewControlLayout = QGridLayout()
        viewControlLayout.addWidget(self.stepBackwardButton, 0, 0,
Qt.AlignCenter)
        viewControlLayout.addWidget(self.playButton, 0, 1, Qt.AlignCenter)
        viewControlLayout.addWidget(self.stepForwardButton, 0, 2,
Qt.AlignCenter)
        viewControlLayout.addWidget(self.stopButton, 0, 3, Qt.AlignCenter)
        viewControlLayout.addWidget(self.updateButton, 0, 4, Qt.AlignCenter)
        viewControlLayout.addWidget(self.viewParentButton, 0, 5,
Qt.AlignCenter)
        viewControlLayout.addWidget(self.viewChildrenButton, 0, 6,
Qt.AlignCenter)
        viewControlLayout.addWidget(self.view3DButton, 0, 7, Qt.AlignCenter)
        viewControlLayout.addItem(self.rightSpacer, 0, 8)
        
        viewInfoLayout = QGridLayout()
        viewInfoLayout.addWidget(self.stepLabel, 0, 6)
        viewInfoLayout.addWidget(self.stepLineEdit, 0, 7)
        viewInfoLayout.addWidget(self.stepSizeLabel, 0, 8)
        viewInfoLayout.addWidget(self.stepSizeSlider, 0, 9)
        viewInfoLayout.addWidget(self.stepSizeLineEdit, 0, 10)
        
        gridLayout = QGridLayout()
        gridLayout.addLayout(treeControlLayout, 0, 0)
        gridLayout.addWidget(self.tree, 1, 0)
        gridLayout.addLayout(viewControlLayout, 0, 1)
        gridLayout.addWidget(self.view, 1, 1)
        gridLayout.addLayout(viewInfoLayout, 2, 1)
        
        self.setLayout(gridLayout)
        
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