Python 具名元祖

具名元祖可以方便的声明一个数据类型，像是一个小型的类，来看下面这个栗子

from collections import namedtuple

Card = namedtuple("Card", "rank suit")


class Poker:
    ranks = [str(n) for n in range(2, 11)] + list("JQKA")
    suits = "spades hearts diamonds clubs".split()

    def __init__(self):
        self.cards = [Card(c, s) for s in self.suits
                      for c in self.ranks]

    def __len__(self):
        return len(self.cards)

    def __getitem__(self, item):
        return self.cards[item]


p = Poker()
print(p.cards)
print(len(p.cards))