calling system command in window is very slow in python 2.5.1

[wang frank]

Hi,
 
I am running a python script that will change the attribute of a directory and its subdiretory by command:
 
os.system("chmod -R 7777 .")
 
or 
 
os.system("attrib -R * /S")
 
Both commands chmod and attrib run quite fast in dos command shell. However, inside python, they are very slow and I have to kill them by Control-C. I do not know why?
 
Can anyone help me to figure it out? 
 
Thanks
 
Frank
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