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我正在使用 xfce 运行 Linux Mint 13。使用这个线程中的脚本，我能够让 cronjob 以这种格式运行：

PATH=/usr/bin/python/:/usr/bin/python3/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

# The Wallpaper Changer
0 * * * * /home/tessitura/8BitDay/set.py

...但我遇到了脚本本身的一些问题。照原样，只更改目录名称，它给了我以下错误：

Traceback (most recent call last):
  File "./set.py", line 19, in <module>
    os.rename('now.png', current)    
OSError: [Errno 2] No such file or directory

我试着稍微调整一下代码，它有点工作；壁纸更改，但now.png最终被删除，导致 cronjob 运行时出现空白图像。这是我现在拥有的：

#!/usr/bin/python3    

# Finds the current hour
import datetime
time = int(str(datetime.datetime.now().time()).split(":")[0])    

# Needed for renaming files
import os    

# List of all files in the folder
files = ['05-Evening.png', 'set.py', '07-Night.png', '01-Morning.png', '03-Afternoon.png', '06-Late-Evening.png', '08-Late-Night.png', '04-Late-Afternoon.png', '02-Late-Morning.png', 'now.png']   

# Finds which wallpaper is currently set
directory = "/home/tessitura/8BitDay/"
for filename in os.listdir(directory):
    files.remove(files[files.index(filename)])
    current = ''.join(filename)    

# Puts back the current wallpaper
path = os.path.join(directory, 'now.png')
os.rename(path, current)    

# Gets out the new wallpaper based on time
if 0 <= time <= 3:
    os.rename('08-Late-Night.png', 'now.png')
elif 4 <= time <= 5:
    os.rename('01-Morning.png', 'now.png')
elif 6 <= time <= 10:
    os.rename('02-Late-Morning.png', 'now.png')
elif 11 <= time <= 14:
    os.rename('03-Afternoon.png', 'now.png')
elif 15 <= time <= 16:
    os.rename('04-Late-Afternoon.png', 'now.png')
elif 17 <= time <= 18:
    os.rename('06-Late-Evening.png', 'now.png')
elif 19 <= time <= 23:
    os.rename('07-Night.png', 'now.png')    

# Refreshes the desktop
os.system("xfdesktop --reload")

更新：Blckknght 的解决方案修复了脚本。在 Mint 13 中一切都很好，但我已经升级到 Mint 17.1，我又遇到了问题。该脚本可以独立运行，但这次的问题在于 crontab。运行每小时 cronjob 会导致：

Failed to parse arguments: Cannot open display:

我将cronjob更改为...

PATH=/usr/bin/python/:/usr/bin/python3/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
@hourly DISPLAY=:0.0 /home/tessitura/8BitDay/set.py > /home/tessitura/set.log 2>&1

这给了我这个错误：

Failed to connect to session manager: Failed to connect to the session manager: SESSION_MANAGER environment variable not defined

** (xfdesktop:9739): WARNING **: xfdesktop: already running, quitting.
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1 回答 1

4

您当前的代码比它需要的更复杂，因为您正在重命名文件，因此需要将当前now.png文件重命名回其原始名称。

将适合该时间的文件复制到新名称会简单得多，如果存在的话，覆盖该位置的现有文件。因为您是在复制而不是重命名，所以您永远不需要反转该过程。

这是使用以下代码执行此操作的代码版本shutil.copy：

import datetime
import os
import shutil

time = datetime.datetime.now().hour  # no need for string parsing to get the hour

# Gets out the new wallpaper based on time
if 0 <= time <= 3:
    shutil.copy('08-Late-Night.png', 'now.png')
elif 4 <= time <= 5:
    shutil.copy('01-Morning.png', 'now.png')
elif 6 <= time <= 10:
    shutil.copy('02-Late-Morning.png', 'now.png')
elif 11 <= time <= 14:
    shutil.copy('03-Afternoon.png', 'now.png')
elif 15 <= time <= 16:
    shutil.copy('04-Late-Afternoon.png', 'now.png')
elif 17 <= time <= 18:
    shutil.copy('06-Late-Evening.png', 'now.png')
elif 19 <= time <= 23:
    shutil.copy('07-Night.png', 'now.png')    

# Refreshes the desktop
os.system("xfdesktop --reload")
于 2015-01-06T19:27:37.113 回答