Hi,

I was following along with the video. I entered the code as shown but I am throwing these errors when running. I’ve reviewed countless times and cannot find where I went wrong:

#!/usr/bin/env python

import subprocess
import optparse

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”])
subprocess.call([“ifconfig”, interface])

parser = optparse.OptionParser()

parser.add_option(“-i”, “–interface”, dest=”interface”, help=”Interface to change it’s MAC Address”)
parser.add_option(“-m”, “–mac”, dest=”new_mac”, help=”New MAC Address”)

(options, arguments) = parser.parse_args()

change_mac(options.interface, options.new_mac)

Here is the error:

/root/PycharmProjects/hello/venv/bin/python /root/PycharmProjects/hello/mac_changer.py
Traceback (most recent call last):
File “/root/PycharmProjects/hello/mac_changer.py”, line 21, in <module>
change_mac(options.interface, options.new_mac)
File “/root/PycharmProjects/hello/mac_changer.py”, line 7, in change_mac
print(“[+] Changing MAC Address for ” + interface + ” to ” + new_mac)
TypeError: can only concatenate str (not “NoneType”) to str

Process finished with exit code 1