from collections import namedtuple
 Subscriber = namedtuple('Subscriber', ['addr', 'joined'])
 sub = Subscriber('jonesy@example.com', '2012-10-19')
 sub
 Subscriber(addr='jonesy@example.com', joined='2012-10-19')
 sub.addr
 'jonesy@example.com'
 sub.joined
 '2012-10-19'