大列标签：将文本旋转到90度？

Question

我的列标签太大，如下例所示。如何将标题标签旋转到90度？你知道我怎么能这么简单吗？

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

data = {'Large Table Columns 1':['1','2','3'], 'Large Table Columns 2':['4','5','6'], 'Large Table Columns 3':['7','8','9']}

class MyTable(QTableWidget):
    def __init__(self, data, *args):
        QTableWidget.__init__(self, *args)
        self.data = data
        self.setmydata()
        self.resizeColumnsToContents()
        self.resizeRowsToContents()

    def setmydata(self):

        horHeaders = []
        for n, key in enumerate(sorted(self.data.keys())):
            horHeaders.append(key)
            for m, item in enumerate(self.data[key]):
                newitem = QTableWidgetItem(item)
                self.setItem(m, n, newitem)
        self.setHorizontalHeaderLabels(horHeaders)

def main(args):
    app = QApplication(args)
    table = MyTable(data, 5, 3)
    table.show()
    sys.exit(app.exec_())

if __name__=="__main__":
    main(sys.argv)