How does python view system network traffic information and python network traffic?

How does python view system network traffic information and python network traffic?

Preface

The traffic information can be directly stored in/proc/net/devTo view, the program implemented by the author uses the command:

python net.py interface

WhereinterfaceIt is the name of the network card, which network card is used, and which network card is available on the computer.

sudo ifconfig

.

The Python implementation program is as follows:

# coding:utf-8import 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     0vmnet1:    0    0  0  0  0   0     0     0    0   56  0  0  0   0    0     0vmnet8:    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)

Program entry fromif name=='main'First, get it through parameters.interfaceAnd then callget_net_data()The function obtains the traffic information, followed by some data processing processes.

Summary

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