python:偷取bing首页面图片作为桌面背景

import osimport sysimport randomimport urllibimport win32guiimport win32conimport Imageclass StealBing:    def __init__(self):        self.content = urllib.urlopen('http://cin.bing.com/').read()        self.bgImageUrl = ''        self.localFileName = ''        self.localBMPFileName = ''    def parserImageUrl(self):        temp = self.content[self.content.index('g_img={url:') + len('g_img={url:') + 1 : len(self.content)]        temp = temp[0 : temp.index(',id:') - 1]        print temp        print temp        self.bgImageUrl = temp    def createLocalFileName(self):        randomStr = ''.join(random.sample(['a','b','c','d','e','f','g','h','i','j', 'k', 'l',                                           'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'], 6)).replace('', '')        self.localFileName = 'd:\\bg_pictures\\' + randomStr + '.jpg'        self.localBMPFileName = 'd:\\bg_pictures\\' + randomStr + '.bmp'    def downloadImage(self):        if self.bgImageUrl == '':            self.parserImageUrl()        if self.localFileName == '':            self.createLocalFileName()        data = urllib.urlretrieve(self.bgImageUrl, self.localFileName)    def updateBGImage(self):        img = Image.open(self.localFileName)        img.save(self.localBMPFileName)        os.remove(self.localFileName)        win32gui.SystemParametersInfo(win32con.SPI_SETDESKWALLPAPER, self.localBMPFileName, 0)stealing = StealBing()stealing.downloadImage()stealing.updateBGImage()