geek.py

# author -> geeksceo

def ipv6_verificator(str):
    if (':' not in str) or (':'*3 in str) or (len(str.split(':')) < 8 and str.count('::') != 1) :
        return "That's not IPv6 address !"

    for i in str.split(':'):
        if i != '':
            try:
                int(i, 16)
            except ValueError:
                return "This string is not in hexadecimal format, \n That's not IPv6 address !"
                break

    return "It's IPv6 Address !"

Verified if an address is an IPv6 address.