python 计算文件内数字之和

#! /usr/bin/env python

import sys,os
import string
import re

# FILE_DIR = "/root"
# FILE_NAME = "dmesg.log"

# cd FILE_DIR

# f=open('$FILE_NAME','r')

f=open('/root/dmesg.log','r')

Line=f.read()
NubStore=re.findall(r'\d+',Line)
print NubStore
sum=0
for i in NubStore:
sum=sum+string.atoi(i)
#print len(NubStore)
print sum