Question

当我运行代码时，第一次打印出套牌，但第二次打印“无”。我认为套牌清单由于某种原因被覆盖，但无法弄清楚原因。任何帮助将不胜感激。

class Deck(object):
  def __init__(self,deck=['2c','3c','4c','5c','6c','7c','8c','9c','tc','jc','qc','kc','ac','2d','3d','4d','5d','6d','7d','8d','9d','td','jd','qd','kd','ad','2h','3h','4h','5h','6h','7h','8h','9h','th','jh','qh','kh','ah','2s','3s','4s','5s','6s','7s','8s','9s','ts','js','qs','ks','as']):
      self.deck=deck

  def shuffle_cards(self):
      self.deck=random.shuffle(self.deck)

l=Deck()
print l.deck
l.shuffle_cards()
print l.deck

Answer 1

shuffle就位（https://docs.python.org/2/library/random.html#random.shuffle）

random.shuffle(self.deck)

将取代

self.deck=random.shuffle(self.deck)

btw：mutable默认参数值不完美

python随机数错误（二十一点游戏）

1 个答案: