(1) os.system
# 仅仅在一个子终端运行系统命令,而不能获取命令执行后的返回信息
system(command) -> exit_status
Execute the command (a string) in a subshell.
# 如果再命令行下执行,结果直接打印出来
>>> os.system('ls') .CHM bash document media py-django video .wmv books downloads Pictures python all- Desktop Examples project tools
(2) os.popen
# 该方法不但执行命令还返回执行后的信息对象
popen(command [, mode='r' [, bufsize]]) -> pipe
Open a pipe to/from a command returning a file object.
例如:
>>>tmp = os.popen('ls *.py').readlines() >>>tmp Out[]: ['dump_db_pickle.py ', 'dump_db_pickle_recs.py ', 'dump_db_shelve.py ', 'initdata.py ', '__init__.py ', 'make_db_pickle.py ', 'make_db_pickle_recs.py ', 'make_db_shelve.py ', 'peopleinteract_query.py ', 'reader.py ', 'testargv.py ', 'teststreams.py ', 'update_db_pickle.py ', 'writer.py ']
好处在于:将返回的结果赋于一变量,便于程序的处理。