toutes les lignes+colonnes d'un QTreeWidget

import sys
from PyQt4 import QtGui
from PyQt4.QtGui import QTreeWidget
class Dialogue(QtGui.QDialog):
	def __init__(self):
		super( Dialogue, self ).__init__()
		self.gL=QtGui.QGridLayout()
		self.tree=QTreeWidget()
		self.tree.setHeaderLabels(["un","deux"])
		for lig in range(3):
			item = QtGui.QTreeWidgetItem()
			for col in range(2):
				item.setText( col, str(lig)+"/"+str(col) )
			self.tree.addTopLevelItem(item)
		self.gL.addWidget(self.tree, 0, 1, 1, 1 )
		self.setLayout(self.gL)
app=QtGui.QApplication( sys.argv )
window=Dialogue()
window.show()
sys.exit( app.exec_() )

	for lig in ... :
		for col in ... :
			print ( tree[lig,col]... )