linux系统使用python监测网络接口获取网络的输入输出

#!/usr/bin/env Python
import time
import sys

if len(sys.argv) > 1:
 INTERFACE = sys.argv[1]
else:
 INTERFACE = 'eth0'
STATS = []
print 'Interface:',INTERFACE

def rx():
 ifstat = open('/proc/net/dev').readlines()
 for interface in  ifstat:
  if INTERFACE in interface:
   stat = float(interface.split()[1])
   STATS[0:] = [stat]

def tx():
 ifstat = open('/proc/net/dev').readlines()
 for interface in  ifstat:
  if INTERFACE in interface:
   stat = float(interface.split()[9])
   STATS[1:] = [stat]

print 'In   Out'
rx()
tx()

while True:
 time.sleep(1)
 rxstat_o = list(STATS)
 rx()
 tx()
 RX = float(STATS[0])
 RX_O = rxstat_o[0]
 TX = float(STATS[1])
 TX_O = rxstat_o[1]
 RX_RATE = round((RX - RX_O)/1024/1024,3)
 TX_RATE = round((TX - TX_O)/1024/1024,3)
 print RX_RATE ,'MB  ',TX_RATE ,'MB'