代碼如下:
# -*- coding: UTF-8 -*-

from __future__ import unicode_literals
import Image
import datetime
import win32gui,win32con,win32api
import re
from HttpWrapper import SendRequest

StoreFolder = "c://dayImage"

def setWallpaperFromBMP(imagepath):
    k = win32api.RegOpenKeyEx(win32con.HKEY_CURRENT_USER,"Control Panel//Desktop",0,win32con.KEY_SET_VALUE)
    win32api.RegSetValueEx(k, "WallpaperStyle", 0, win32con.REG_SZ, "2") #2拉伸適應桌面,0桌面居中
    win32api.RegSetValueEx(k, "TileWallpaper", 0, win32con.REG_SZ, "0")
    win32gui.SystemParametersInfo(win32con.SPI_SETDESKWALLPAPER,imagepath, 1+2)

def setWallPaper(imagePath):
    """
    Given a path to an image, convert it to bmp and set it as wallpaper
    """
    bmpImage = Image.open(imagePath)
    newPath = StoreFolder + '//mywallpaper.bmp'
    bmpImage.save(newPath, "BMP")
    setWallpaperFromBMP(newPath)

def getPicture():
    url = "http://photography.nationalgeographic.com/photography/photo-of-the-day/"
    h = SendRequest(url)
    if h.GetSource():
        r = re.findall('<div class="download_link"><a href="(.*?)">Download',h.GetSource())
        if r:
            return SendRequest(r[0]).GetSource()
        else:
            print "解析圖片地址出錯，請檢查正則表達式是否正確"
            return None

def setWallpaperOfToday():
    img = getPicture()
    if img:
        path = StoreFolder + "http://%s.jpg" % datetime.date.today()
        f = open(path,"wb")
        f.write(img)
        f.close()
        setWallPaper(path)

setWallpaperOfToday()
print 'Wallpaper set ok!'

其中的httpwrapper是我寫的一個http訪問的封裝：
代碼如下:
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
#-------------------------------------------------------------------------------
# Name: 對http訪問的封裝
#
# Author: qianlifeng
#
# Created: 10-02-2012
#-------------------------------------------------------------------------------

import base64
import urllib
import urllib2
import time
import re
import sys

class SendRequest:
  """
  網頁請求增強類
  SendRequest('http://xxx.com',data=dict, type='POST', auth='base',user='xxx', password='xxx')