ip_addr_valid.py

import sys

#Checking octets
def ip_addr_valid(list):

    for ip in list:
        ip = ip.rstrip("\n")
        octet_list = ip.split('.')
        
        if (len(octet_list) == 4) and (1 <= int(octet_list[0]) <= 223) and (int(octet_list[0]) != 127) and (int(octet_list[0]) != 169 or int(octet_list[1]) != 254) and (0 <= int(octet_list[1]) <= 255 and 0 <= int(octet_list[2]) <= 255 and 0 <= int(octet_list[3]) <= 255):
            continue
        
        else:
            print('\n* There was an invalid IP address in the file: {} : (\n'.format(ip))
            sys.exit()