python:偷取bing首页面图片作为桌面背景

import os
import sys
import random
import urllib
import win32gui
import win32con
import Image

class 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()