python-模块间的导入与os.system('xxx')的shell命令执行

在一个大模块中导入一个小的特定子模块，如在sys大模块中导入sys.path的子模块，其他的sys子模块无法使用

root@kali:~# python

Python 2.7.3 (default, Mar 14 2014, 11:57:14)

[GCC 4.7.2] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from sys import path       //导入子模块sys.path

>>> sys.version_info

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'sys' is not defined

>>> path

['', '/usr/local/lib/python2.7/dist-packages/frida-4.4.0-py2.7-linux-i686.egg', '/usr/local/lib/python2.7/dist-packages/Pygments-2.0.2-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/prompt_toolkit-0.45-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/colorama-0.3.3-py2.7.egg',
'/usr/local/lib/python2.7/dist-packages/wcwidth-0.1.4-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/six-1.9.0-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/androguard-3.0-py2.7.egg', '/usr/lib/python2.7/dist-packages/pybloomfiltermmap-0.3.11-py2.7-linux-i686.egg',
'/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL',
'/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode']

>>>

导入两个子模块的方式

root@kali:~# python

Python 2.7.3 (default, Mar 14 2014, 11:57:14)

[GCC 4.7.2] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from sys import path,version_info        //导入两个子模块的方式

>>> path

['', '/usr/local/lib/python2.7/dist-packages/frida-4.4.0-py2.7-linux-i686.egg', '/usr/local/lib/python2.7/dist-packages/Pygments-2.0.2-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/prompt_toolkit-0.45-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/colorama-0.3.3-py2.7.egg',
'/usr/local/lib/python2.7/dist-packages/wcwidth-0.1.4-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/six-1.9.0-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/androguard-3.0-py2.7.egg', '/usr/lib/python2.7/dist-packages/pybloomfiltermmap-0.3.11-py2.7-linux-i686.egg',
'/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL',
'/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode']

>>>

>>> version_info

sys.version_info(major=2, minor=7, micro=3, releaselevel='final', serial=0)

>>>

导入大模块

>>>

>>> import sys,os    //导入两个大模块的方式

>>> os.system('pwd')

/root

0

>>> os.system('uname-a')

sh: 1: uname-a: not found

32512

>>>

>>> from sys import version_info as v     //使用别名，除非名字非常长才用

>>> v

sys.version_info(major=2, minor=7, micro=3, releaselevel='final', serial=0)

>>>

os.system('xxxx')就是shell命令执行语句

>>> os.system('pwd')

/root

0

>>> os.system('df -a')

文件系统                                                  1K-块    已用    可用 已用% 挂载点

rootfs                                                 19620732 8692020 9908964   47% /

sysfs                                                         0       0       0     - /sys

proc                                                          0       0       0     - /proc

udev                                                      10240       0   10240    0% /dev

devpts                                                        0       0       0     - /dev/pts

tmpfs                                                     51188     568   50620    2% /run

/dev/disk/by-uuid/1d69c4b7-8825-4a6e-a4a4-e1ef94f2d30f 19620732 8692020 9908964   47% /

tmpfs                                                      5120       0    5120    0% /run/lock

tmpfs                                                    282580     564  282016    1% /run/shm

fusectl                                                       0       0       0     - /sys/fs/fuse/connections

vmware-vmblock                                                0       0       0     - /run/vmblock-fuse

binfmt_misc                                                   0       0       0     - /proc/sys/fs/binfmt_misc

0

>>>