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代码：
import os
import time
source = ['D:\Desktop\phy.txt']
target_dir = 'D:\sublime text'
today = target_dir + time.strftime('%Y%m%d')
now = time.strftime('%H%M%S')
if not os.path.exists(today):
os.mkdir(today)
print('sucessfully created directory',today)
target = today + os.sep + now + '.rar'
rar_command = 'C:\Program Files\WinRAR\Rar.exe''a%s%s%(target,''.join(source))'
if os.system(rar_command) == 0:
print('successful back up to',target)
else:
print('failed')
为什么会跳转到
sucessfully created directory D:\sublime text20161027
failed
[Finished in 3.3s]
为什么会变成failed，而不是successful back up to',target？
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