Python os.system 和 os.popen的区别

(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
3 04101419778.CHM   bash      document    media      py-django   video
4
5 11.wmv            books     downloads   Pictures  python
6
7 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
 3 >>>tmp
 4
 5 Out[]:
 6
 7 [‘dump_db_pickle.py ‘,
 8
 9 ‘dump_db_pickle_recs.py ‘,
10
11 ‘dump_db_shelve.py ‘,
12
13 ‘initdata.py ‘,
14
15 ‘__init__.py ‘,
16
17 ‘make_db_pickle.py ‘,
18
19 ‘make_db_pickle_recs.py ‘,
20
21 ‘make_db_shelve.py ‘,
22
23 ‘peopleinteract_query.py ‘,
24
25 ‘reader.py ‘,
26
27 ‘testargv.py ‘,
28
29 ‘teststreams.py ‘,
30
31 ‘update_db_pickle.py ‘,
32
33 ‘writer.py ‘]

好处在于：将返回的结果赋于一变量，便于程序的处理。