import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class MeinDialog(QTreeWidget):
    def __init__(self):
        QTreeWidget.__init__(self)
        self.setColumnCount(1)
        items = []
        for i in range(10):
            items.append(QTreeWidgetItem(None, QStringList(QString("item: %1").arg(i))))
        self.addTopLevelItems(items)
        self.setSortingEnabled(True)

app = QApplication(sys.argv)
dialog = MeinDialog()
dialog.show()
sys.exit(app.exec_())