A simple bandwidth monitoring using /proc/net/dev

bandwidth.py

#!/usr/bin/env python
import time

def getRxTx():
    rx = 0L
    tx = 0L
    with open("/proc/net/dev") as dev:
        data = dev.read()
        data = data.split("\n")[2:]
        for iface in data:
            iface = iface.split()
            if not iface: break
            rx += long(iface[1])
            tx += long(iface[9])
    return (rx,tx)

def getMetric(value):
   gauge = "B"
   if value > 1024:
       gauge = "KB"
       value =  round(value/1024.0,2)
   if value > 1024:
       gauge = "MB"
       value = round(value/1024.0,2)
   return "%s %s" % (value, gauge)

(rx, tx) = getRxTx()
time.sleep(1)
(nrx, ntx) = getRxTx()
print "D: %s/s\nU: %s/s" % ( getMetric(nrx-rx), getMetric(ntx-tx))

thank you for sharing