How to view system network traffic information in python

Preface

Traffic information can be viewed directly in /proc/net/dev. The program implemented by the author uses the command:

python net.py interface

interface is the name of the network card, what network card to use, what network cards the computer has, you can use

sudo ifconfig

Check it out.

The program implemented in Python is as follows:

# coding:utf-8
import sys, time, os


'''
Inter-|  Receive                        | Transmit
 face |bytes  packets errs drop fifo frame compressed multicast|bytes  packets errs drop fifo colls carrier compressed
  lo:  28169   364  0  0  0   0     0     0  28169   364  0  0  0   0    0     0
 wlan1: 7432984  6018  0  0  0   0     0     0  681381  6115  0  0  0   0    0     0
vmnet1:    0    0  0  0  0   0     0     0    0   56  0  0  0   0    0     0
vmnet8:    0    0  0  0  0   0     0     0    0   55  0  0  0   0    0     0
 eth0:    0    0  0  0  0   0     0     0    0    0  0  0  0   0    0     0

'''

_unit_=['B','KB','MB','GB','TB']

def get_net_data(interface):
  for line in open('/proc/net/dev', 'r'):
    if line.split(':')[0].find(interface)>=0:
      return map(int, line.split(':')[1].split())

def convert_bytes_to_string(b):
  cnt = 0
  while b >= 1024.0:
    b = float(b) / 1024.0
    cnt += 1
  return '%.2f%s'%(b,_unit_[cnt])

if __name__ == '__main__':
  interface = sys.argv[1]
  while True:
    net_data = get_net_data(interface)
    receive_data_bytes = net_data[0]
    transmit_data_bytes = net_data[8]
    os.system('clear')
    print 'Interface:%s  -> Receive Data: %s  Transmit Data: %s'%(interface, convert_bytes_to_string(receive_data_bytes), convert_bytes_to_string(transmit_data_bytes))
    time.sleep(1)

The program entry is from if Starting from name=='main', first get the interface through the parameters, and then call the get_net_data() function to get the traffic information, followed by some data processing.

Summary

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