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Á½Õß¾ùÐè import os
(1) os.system
# ½ö½öÔÚÒ»¸ö×ÓÖÕ¶ËÔËÐÐϵͳÃüÁ¶ø²»ÄÜ»ñÈ¡ÃüÁîÖ´ÐкóµÄ·µ»ØÐÅÏ¢
system(command) -> exit_status   
Execute the command (a string) in a subshell.  
# Èç¹ûÔÙÃüÁîÐÐÏÂÖ´ÐУ¬½á¹ûÖ±½Ó´òÓ¡³öÀ´
>>> os.system('ls')  
04101419778.CHM   bash      document    media      py-django   video   
11.wmv            books     downloads   Pictures  python   
all-20061022      Desktop   Examples    project    tools
(2) os.popen
# ¸Ã·½·¨²»µ«Ö´ÐÐÃüÁ·µ»ØÖ´ÐкóµÄÐÅÏ¢¶ÔÏó
popen(command [, mode='r' [, bufsize]]) -> pipe     
Open a pipe to/from a command returning a file object.    
    
ÀýÈ磺
>>>tmp = os.popen('ls *.py').readlines()   
   
>>>tmp   
Out[21]:    
['dump_db_pickle.py\n',   
'dump_db_pickle_recs.py\n',   
'dump_db_shelve.py\n',   
'initdata.py\n',   
'__init__.py\n',   
'make_db_pickle.py\n',   
'make_db_pickle_recs.py\n',   
'make_db_shelve.py\n',   
'peopleinteract_query.py\n',   
'reader.py\n',   
'testargv.py\n',   
'teststreams.py\n',   
'update_db_pickle.py\n',   
'writer.py\n']   
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