#random wallpaper changer!
import _winreg
from os import walk
from os.path import exists
from random import randint
 
#first grab a registry handle.
#_winreg.KEY_SET_VALUE
handle = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER,r'Control Panel\Desktop',0,_winreg.KEY_WRITE)
print "Registry Handle Created with KEY_SET_VALUE mask"
 
def GenerateListOfWallpapers():
    targetDir = 'C:\Documents and Settings\Enrico Jr\My Documents\Jr\'s Wallpapers'
    fileNames = []
    filePaths = []
    if exists(targetDir):
        #proceed to make the list of files
        for x,y,z in walk(targetDir):
            for name in z:
                fileNames.append(name)
        for item in fileNames:
            filePaths.append(targetDir + '\\' + item)
        return filePaths
 
def RandomlySelectWallpaper(filePaths):
    index = randint(0,len(filePaths)-1)
    RandomlySelectedWallpaper = filePaths[index]
    return RandomlySelectedWallpaper #it should be a string...
 
#now to edit the wallpaper registry key
newWallpaper = RandomlySelectWallpaper(GenerateListOfWallpapers())
print "Registry Handle Created."
print "Random wallpaper selected."
_winreg.SetValueEx(handle,'ConvertedWallpaper',0,_winreg.REG_SZ,newWallpaper)
print "New wallpaper value set."