python 界面编程　并执行sh命令

#!/usr/bin/python
# -*- coding: UTF-8 -*-
from Tkinter import *           # 导入 Tkinter 库
import thread
import time
import os
class MessageShow:
def __init__(self):

#传入参数　消息内容　和这条消息显示的时间

#消息显示的时间
#self.WaitTime=time
self.root = Tk()                     # 创建窗口对象的背景色
self.root.wm_title("机器人控制主窗口")#title
#居中显示
self.root.resizable(False,False)
self.root.update() # update window ,must do
curWidth = self.root.winfo_reqwidth() # get current width
curHeight = self.root.winfo_height() # get current height
scnWidth,scnHeight = self.root.maxsize() # get screen width and height
# now generate configuration information
tmpcnf = '%dx%d+%d+%d'%(200,100,
(scnWidth-curWidth)/2,(scnHeight-curHeight)/2)
self.root.geometry(tmpcnf)

#l1=Label(self.root,text=message,background="yellow")
#font=("宋体", 12, "normal")
#l1=Label(self.root,text=message,foreground="red")
#l1.pack(side=TOP,expand=YES)
b1=Button(self.root,text="启动机器人虚拟驱动",command=self.b1Command)
#b1['width']=10
#b1['height']=1
b1.pack(side=TOP,expand=YES)
b2=Button(self.root,text="启动机器人虚拟路径导航界面",command=self.b2Command)
b2.pack()
b3=Button(self.root,text="启动机器人movebase",command=self.b3Command)
b3.pack()

#thread.start_new_thread(self.autoDestory,())

self.root.mainloop()                 # 进入消息循环
def b1Command(self):
os.system("gnome-terminal -x bash -c \"roslaunch agv fakeMinimalAGV.launch\"")
def b2Command(self):
os.system("gnome-terminal -x bash -c \"roslaunch agv mplannerfake.launch\"")
def b3Command(self):
os.system("gnome-terminal -x bash -c \"roslaunch agv move_base.launch\"")
def autoDestory(self):
time.sleep(self.WaitTime)
self.root.destroy()
if __name__=='__main__':
MessageShow()