Python执行外部程序

# -*- coding:UTF-8 -*- 

import os
import subprocess

class ExeMgr(object):
    '''
Python管理应用程序
    '''

    def __init__(self,appPath):
        '''
        appPath:要启动的应用程序的路径
        pid:启动的进程id
        '''
        self.appPath = appPath
        self.pid = None
        
    def start(self):
        '''
            启动应用程序
        '''
        #判断应用程序路径是否存在
        if(os.path.exists(self.appPath)):
            p = subprocess.Popen(self.appPath)
            self.pid = p.pid
            if self.pid is None:
                return False
            return True
        else:
            print '应用程序路径'+self.appPath+'不存在'
            
            
if __name__ == '__main__':
    
    exeMgr = ExeMgr(r"C:\Program Files\Tencent\QQ\Bin\QQ.exe")
    exeMgr.start()
    print '程序已成功启动'