Python MAC changer

#--------------------------------------
# Tool to change the mac address of a machine
# Programmar: Saleh J. Makkawy
#---------------------------------

# All moduals needed for the tool
import subprocess
import optparse

# Function to read arguments from user
def get_arguments():
    parser = optparse.OptionParser()
    parser.add_option("-i","--interface",dest="interface", help="Interface to change its MAC address")
    parser.add_option("-m","--mac",dest="new_mac", help="New MAC address.")
    (otions,arguments)=parser.parse_args()
    if not options.interface:
        parser.error("[-] Please specifiy an interface, use --help or -h for more help.")
    elif not options.new_mac:
        parser.error("[-] Please specifiy a new mac, use --help or -h for more help.")
    return options


def change_mac(interface, new_mac):
    print("[+] Changing MAC address for"+ interface + "to"+ new_mac)
    subprocess.call(["ifconfig",interface,"down"])
    subprocess.call(["ifconfig",interface,"hw", "ether", new_mac])
    subprocess.call(["ifconfig",interface,"up"])    

# options =get_arguments()
# change_mac(options.interface, options.new_mac)

ifconfig_result= subprocess.check_output(["ifconfig", options.interface])
print(ifconfig_result)