具有多列的QTreeWidget限制子项的数量

import sys
from PyQt4.QtGui import QApplication, QWidget, QTreeWidget, QTreeWidgetItem, QVBoxLayout
from PyQt4.QtCore import QStringList

app = QApplication(sys.argv)

win = QWidget()
win.resize(320, 240)
win.setWindowTitle(\"Hello, Overflowers!\")

treeWidget = QTreeWidget()
treeWidget.setColumnCount(1)

def addChildWidgets(parent, depth=1):
    child = QTreeWidgetItem(parent, QStringList([repr(depth)]*(depth+1)))
    if (depth<12):
        addChildWidgets(child, depth+1)
    return child

item = QTreeWidgetItem(treeWidget, QStringList([\"root\"]))
addChildWidgets(item)    

treeWidget.insertTopLevelItems(0, [item])

layout = QVBoxLayout()
layout.addWidget(treeWidget)

win.setLayout(layout)
win.show()

sys.exit(app.exec_())

treeWidget.setColumnCount(10)