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Python script output in file

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Hi,

I have a perl script named "my_eth-traffic.pl" which calculates the tx and
rx speed of the Ethernet interface in Mb.

I want to run this script from another script and want the output in other
file.
So i wrote the following script but not getting the output.

#!/usr/bin/python

import sys
import subprocess
import datetime
import os
import time

comand8 = "/root/Desktop/my_eth-traffic.pl eth0 M"

filename = logfilename+packetsize+'-'+formated_string+'.txt'
    logfile = open("/root/Desktop/speed.txt", 'w')


proc=subprocess.Popen(comand8,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    for line in proc.stdout:
                   logfile.write(line)

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Python script output in file Robert Clove <cloverobert@gmail.com> - 2015-03-18 06:35 -0400
  Re: Python script output in file Rustom Mody <rustompmody@gmail.com> - 2015-03-18 03:49 -0700
    Re: Python script output in file Robert Clove <cloverobert@gmail.com> - 2015-03-18 07:41 -0700
      Re: Python script output in file Rustom Mody <rustompmody@gmail.com> - 2015-03-18 11:06 -0700
        Re: Python script output in file Rustom Mody <rustompmody@gmail.com> - 2015-03-18 11:10 -0700

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