Python - input

def convert_ports(ports):

    ports_text = ports.split(",")
    ports_numbers = []

    for p in ports_text:
        try:
            number = int(p)
        except ValueError as ex:
            print("[-] wrong number")
            print(ex)
            return None

        ports_numbers.append(number)

    return ports_numbers


while True:
    print("[*] Enter Target Ports \n For scanning all ports press 'Enter' otherwise write target Ports which you like to scan \n example: 21, 80")

    try:
        ports = input(">: ")
    except KeyboardInterrupt:
        print("\n\n[*] User Requested An Interrupt")
        print("[*] Apllication Shutting Down")
        sys.exit(1)

    ports = ports.strip()

    print('[DEBUG] >{}<'.format(ports))

    # --- exit if no data ---
    if not ports:
        print('[DEBUG] no ports')
        break

    # --- check numbers ---
    ports = convert_ports(ports)
    if ports:
        print('[DEBUG] ports', ports)
        break

if ports:
    for p in ports:
        print("conScan:", p)
        #connScan(host, port)