import os

def mypass():
        mypass = '123'
        return mypass

        
def command(cmd):
        os.popen( "echo %s | sudo -S %s" % (mypass(),cmd) )
        f = open("log.txt", "r")
        text = f.read()
        f.close()
        
        return text

command('iptables -L > log.txt')