Python中执行系统命令常见方法有两种：
两者均需 import os
(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
1 >>> os.system('ls')2 04101419778.CHM bash document media py-django video3 11.wmv books downloads Pictures python4 all-20061022 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：
1 >>>tmp = os.popen('ls *.py').readlines() 2 >>>tmp 3 Out[21]: 4 ['dump_db_pickle.py ', 5 'dump_db_pickle_recs.py ', 6 'dump_db_shelve.py ', 7 'initdata.py ', 8 '__init__.py ', 9 'make_db_pickle.py ',10 'make_db_pickle_recs.py ',11 'make_db_shelve.py ',12 'peopleinteract_query.py ',13 'reader.py ',14 'testargv.py ',15 'teststreams.py ',16 'update_db_pickle.py ',17 'writer.py ']
好处在于：将返回的结果赋于一变量，便于程序的处理。
(3) 使用模块subprocess
1 >>> import subprocess2 >>> subprocess.call (["cmd", "arg1", "arg2"],shell=True)
获取返回和输出:
1 import subprocess2 p = subprocess.Popen('ls', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)3 for line in p.stdout.readlines():4 print line,5 retval = p.wait()
(4) 使用模块commands模块
1 >>> import commands2 >>> dir(commands)3 ['__all__', '__builtins__', '__doc__', '__file__', '__name__', 'getoutput', 'getstatus','getstatusoutput', 'mk2arg', 'mkarg']4 >>> commands.getoutput("date")5 'Wed Jun 10 19:39:57 CST 2009'6 >>>7 >>> commands.getstatusoutput("date")8 (0, 'Wed Jun 10 19:40:41 CST 2009')
注意： 当执行命令的参数或者返回中包含了中文文字，那么建议使用subprocess，如果使用os.popen则会出现下面的错误:
1 Traceback (most recent call last):2 File "./test1.py", line 56, in3 main()4 File "./test1.py", line 45, in main5 fax.sendFax()6 File "./mailfax/Fax.py", line 13, in sendFax7 os.popen(cmd)8 UnicodeEncodeError: 'ascii' codec can't encode characters in position 46-52: ordinal not inrange(128)
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