运维进行时

* BridgeModule -- Allows for simple network bridge management
-------------------------------------------------------------
功能：操作网桥
方法：
list() Returns a dictionary containing the bridges and their connected interfaces.
add_bridge(brname) Creates a new bridge named brname.
add_interface(brname, ifname) Adds interface ifname to bridge brname.
delete_bridge(brname) Deletes bridge brname.
delete_interface(brname, ifname) Removes interface ifname from bridge brname.
add_promisc_bridge(brname, ifname) Creates a new bridge brname, attaches interface ifname to it and sets the MAC address of the connected interface to FE:FF:FF:FF:FF:FF, so traffic can flow freely through the bridge. This is required for use with Xen.
up_bridge(brname) Marks bridge brname and all it's connected interfaces as up.
down_bridge(brname) Marks bridge brname and all it's connected interfaces as down
-------------------------------------------------------------

★零、常用方法：
多语言脚本需要加utf编码加以识别：
#-*-coding:utf-8-*-

系统方法：
type(s)#查看变量类型
id(s)  #查看内存存储ID
dir(s) #查看对象有方法
help(s)#查看s类的完整方法列表。

变量类型转换：
int()
str()
float()
bool()
将字符串False转成bool的False:
a='False'
eval(a)