pyqt cvs保存

# -*- coding: utf-8 -*-
__author__ = 'Administrator'
import sys, csv
from PyQt4 import QtGui, QtCore

class Window(QtGui.QWidget):
    def __init__(self, rows, columns):
        QtGui.QWidget.__init__(self)
        self.table = QtGui.QTableWidget(rows, columns, self)
        for column in range(columns - 1):
            for row in range(rows - 1):
                item = QtGui.QTableWidgetItem('Text%d' % row)
                self.table.setItem(row, column, item)
        self.buttonOpen = QtGui.QPushButton('Open', self)
        self.buttonSave = QtGui.QPushButton('Save', self)
        self.buttonOpen.clicked.connect(self.handleOpen)
        self.buttonSave.clicked.connect(self.handleSave)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.table)
        layout.addWidget(self.buttonOpen)
        layout.addWidget(self.buttonSave)

def handleSave(self):
        path = QtGui.QFileDialog.getSaveFileName(
                self, 'Save File', '', 'CSV(*.csv)')
        if not path.isEmpty():
            with open(unicode(path), 'wb') as stream:
                writer = csv.writer(stream)
                for row in range(self.table.rowCount()):
                    rowdata = []
                    for column in range(self.table.columnCount()):
                        item = self.table.item(row, column)
                        if item is not None:
                            rowdata.append(
                                unicode(item.text()).encode('utf8'))
                        else:
                            rowdata.append('')
                    writer.writerow(rowdata)

def handleOpen(self):
        path = QtGui.QFileDialog.getOpenFileName(
                self, 'Open File', '', 'CSV(*.csv)')
        if not path.isEmpty():
            with open(unicode(path), 'rb') as stream:
                self.table.setRowCount(0)
                self.table.setColumnCount(0)
                for rowdata in csv.reader(stream):
                    row = self.table.rowCount()
                    self.table.insertRow(row)
                    self.table.setColumnCount(len(rowdata))
                    for column, data in enumerate(rowdata):
                        item = QtGui.QTableWidgetItem(data.decode('utf8'))
                        self.table.setItem(row, column, item)

if __name__ == '__main__':

app = QtGui.QApplication(sys.argv)
    window = Window(10, 5)
    window.resize(640, 480)
    window.show()
    sys.exit(app.exec_())