用Python实现动态的切换桌面背景

前两天看了一篇文章《自己写脚本自动更换桌面》，觉得用Python实现起来应该更容易理解，于是就有了下面的dynamic-wallpaper.py脚本。

dynamic-wallpaper.py脚本的完整内容：

#!/usr/bin/python
# -*- coding: utf-8 -*-

import os, os.path, fnmatch, commands

# 壁纸图片所在的目录
wallpaper_path = '/usr/share/backgrounds'


# 搜索所有可用的壁纸
avail_wallpapers = []

for file in os.listdir(wallpaper_path):
    if not os.path.isfile(wallpaper_path + '/' + file):
        continue

    if not fnmatch.fnmatch(file, '*.jpg') and \
       not fnmatch.fnmatch(file, '*.png'):
        continue

    avail_wallpapers.append('file://' + wallpaper_path + '/' + file)

if len(avail_wallpapers) == 0:
amonest@amonest-virtual-machine:~/python$ cat dynamic_wallpaper.py
#!/usr/bin/python
# -*- coding: utf-8 -*-

import os, os.path, fnmatch, commands

# 壁纸图片所在的目录
wallpaper_path = '/usr/share/backgrounds'


# 搜索所有可用的壁纸
avail_wallpapers = []

for file in os.listdir(wallpaper_path):
    if not os.path.isfile(wallpaper_path + '/' + file):
        continue

    if not fnmatch.fnmatch(file, '*.jpg') and \
       not fnmatch.fnmatch(file, '*.png'):
        continue

    avail_wallpapers.append('file://' + wallpaper_path + '/' + file)

if len(avail_wallpapers) == 0:
    exit


# 对所有可用的壁纸排序
avail_wallpapers.sort()


# 获取当前使用的壁纸
current_wallpaper = commands.getoutput('gsettings get org.gnome.desktop.background picture-uri').strip('\'')


# 计算下一张壁纸索引
try:
    current_index = avail_wallpapers.index(current_wallpaper)
except:
    current_index = -1

next_index = current_index + 1

if next_index >= len(avail_wallpapers):
    next_index = 0


# 设置下一张新壁纸
os.system('gsettings set org.gnome.desktop.background picture-uri \'' + avail_wallpapers[next_index] + '\'')