Paint method of QtGui.QGraphicsWidget is not calling with(python 64Bit).

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Hi ,

I am Using python 2.7.2 (64-bit), i have override paint method of QGraphicsWidget class but whenever i move and change the item size , paint method doesn't call.

But when i use python 32- bit it's working.

could anyone help me to figure out the problem.
here is my code.

from PySide import QtCore, QtGui

class Widget(QtGui.QGraphicsWidget):

def init(self,*args):
QtGui.QGraphicsWidget.init(self,*args)
self.setGeometry(2,2,500,500)

def paint(self,*args,**kwargs):
print "calling paint method"

if name == 'main':
import sys
app = QtGui.QApplication(sys.argv)
scene = QtGui.QGraphicsScene()

scene.setSceneRect(0, 0, 800, 480)
minSize = QtCore.QSizeF(30, 100)

prefSize = QtCore.QSizeF(210, 100)

maxSize = QtCore.QSizeF(300, 100)
l = QtGui.QGraphicsAnchorLayout()
l.setSpacing(0)
w = Widget(None, QtCore.Qt.Window)
w.setPos(20, 20)
w.setLayout(l)
scene.addItem(w)
scene.setBackgroundBrush(QtCore.Qt.darkGreen)
view = QtGui.QGraphicsView(scene)
view.show()
sys.exit(app.exec_())