Python系统管理

在linux操作系统上编写shell脚本时, 主要涉及到执行系统命令, 目录和文件操作. 那么在python中怎么办呢, 这主要是几个模块的使用: os, os.path, shutil和sys...

os模块包含了大部分的Linux命令, 简单举例如下:

In [1]: import os

In [2]: os.system('ls -l')

total 12

-rw-r--r-- 1 root root  107 Mar  1 19:31 1.txt

-rw-r--r-- 1 root root  214 Mar  1 19:30 2.txt

lrwxrwxrwx 1 root root   21 Mar  1 22:13 functions.sh -> /etc/init.d/functions

drwxr-xr-x 3 root root 4096 Mar  1 22:16 test

Out[2]: 0

In [4]: os.listdir('.')

Out[4]: ['1.txt', 'functions.sh', '2.txt', 'test']

In [5]: os.chdir('test')

In [6]: os.getcwd()

Out[6]: '/tmp/test'

os.path模块主要是目录和文件操作, 简单举例如下:

In [12]: import os.path

In [13]: os.path.sep

Out[13]: '/'

In [14]: os.path.exists('1.txt')

Out[14]: True

In [15]: os.path.isdir('test')

Out[15]: True

In [16]: os.path.isfile('test')

Out[16]: False

In [17]: os.path.realpath('functions.sh')

Out[17]: '/etc/rc.d/init.d/functions'

In [18]: os.path.abspath('functions.sh')

Out[18]: '/tmp/functions.sh'

In [19]: os.path.split('/etc/rc.d/init.d/functions')

Out[19]: ('/etc/rc.d/init.d', 'functions')

In [21]: os.path.splitext('/tmp/functions.sh')

Out[21]: ('/tmp/functions', '.sh')

In [22]: os.path.dirname('/tmp/functions.sh')

Out[22]: '/tmp'

In [23]: os.path.basename('/tmp/functions.sh')

Out[23]: 'functions.sh'

In [25]: os.path.join('/tmp/test', 'stage')

Out[25]: '/tmp/test/stage'

shutil模块是高层次文件操作, 简单举例如下:

In [26]: import shutil

In [29]: os.rmdir('test')

---------------------------------------------------------------------------

OSError                                   Traceback (most recent call last)

<iPython-input-29-c4255042d84c> in <module>()

----> 1 os.rmdir('test')

OSError: [Errno 39] Directory not empty: 'test'

In [30]: shutil.rmtree('test')

In [34]: shutil.copy('1.txt', '4.txt')

Out[34]: '4.txt'

In [41]: shutil.copytree('test', 'test_bak')

Out[41]: 'test_bak'

In [42]: shutil.move('test_bak', 'stage')

Out[42]: 'stage'

In [47]: shutil.get_unpack_fORMats()

Out[47]:

[('bztar', ['.tar.bz2', '.tbz2'], "bzip2'ed tar-file"),

 ('gztar', ['.tar.gz', '.tgz'], "gzip'ed tar-file"),

 ('tar', ['.tar'], 'uncompressed tar file'),

 ('zip', ['.zip'], 'ZIP file')]

In [48]: shutil.unpack_arcHive('tmux-2.6.tar.gz')

In [50]: shutil.make_archive('tmux26', 'zip', 'tmux-2.6')

Out[50]: '/tmp/tmux26.zip'

sys模块用于处理解释器运行时配置, 和操作系统环境资源交互的, 简单举例如下:

In [58]: import sys

In [59]: sys.argv

Out[59]: ['/root/.pyenv/versions/3.6.4/bin/ipython']

In [63]: sys.path

Out[63]:

['',

 '/root/.pyenv/versions/3.6.4/bin',

 '/root/.pyenv/versions/3.6.4/lib/python36.zip',

 '/root/.pyenv/versions/3.6.4/lib/python3.6',

 '/root/.pyenv/versions/3.6.4/lib/python3.6/lib-dynload',

 '/root/.pyenv/versions/3.6.4/lib/python3.6/site-packages',

 '/root/.pyenv/versions/3.6.4/lib/python3.6/site-packages/IPython/extensions',

 '/root/.ipython']

In [67]: sys.getdefaultencoding()

Out[67]: 'utf-8'

In [68]: sys.getfilesystemencoding()

Out[68]: 'utf-8'

In [79]: sys.modules['os.path']

Out[79]: <module 'posixpath' from '/root/.pyenv/versions/3.6.4/lib/python3.6/posixpath.py'>

In [82]: sys.stderr

Out[82]: <_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>

In [83]: sys.stdin

Out[83]: <_io.TextIOWrapper name='<stdin>' mode='r' encoding='UTF-8'>

In [84]: sys.stderr

Out[84]: <_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>

In [85]: sys.exit

Out[85]: <function sys.exit>