import ipaddress


def isipv6(value):
    """
    Return whether or not given value is an IP version 6.
    If the value is an IP version 6, this function returns ``True``, otherwise ``False``.

    Examples::

        >>> isipv6('2001:41d0:2:a141::1')
        True

        >>> isipv6('127.0.0.1')
        False

    :param value: string to validate IP version 6
    """
    try:
        ip_addr = ipaddress.IPv6Address(value)
    except ipaddress.AddressValueError:
        return False
    return ip_addr.version == 6