tuple containing 2 elements: list with an element validate_ipv4_address and return value of the function _ with an argument string, 'Enter a valid IPv4 address.' for 'ipv4' and tuple containing 2 elements: list with an element validate_ipv6_address, and return value of the function _ with an argument string 'Enter a valid IPv6 address.' for 'ipv6'. define the function ip_address_validators with arguments protocol and unpack_ipv4.
def ip_address_validators ( protocol , unpack_ipv4 ) :