我正在乱搞一副牌。我有一个问题,我读过 eval(repr(object)) 应该等同于对象堆栈溢出主题。
我为我的卡片实现了两个类,一个 Card 类和一个 Deck 类。每个都有一个 repr 方法,我试图在该方法中尽可能接近实际创建对象的语法。Card and Deck的init和repr代码:
class Card(object):
def __init__(self, num, suit):
self.__num = num
self.__suit = suit
def __repr__(self):
return "{!r}({!r},{!r})".format(self.__class__, self.__num, self.__suit)
class Deck(object):
def __init__(self, cards=None):
if not cards:
self.__cards = {"diamonds":[], "hearts":[], "spades":[], "clubs":[]}
else:
self.__cards = cards
def __repr__(self):
return "{!r}({!r})".format(self.__class__, self.__dict__)
这是错误:
print(eval(repr(self.deck.deck)))
File "<string>", line 1
{'hearts': [<class 'cards.Card'>(1,'hearts'), <class 'cards.Card'>(2,'hearts'), <class 'cards.Card'>(3,'hearts'), <class 'cards.Card'>(4,'hearts'), <class 'cards.Card'>(5,'hearts')], 'clubs': [<class 'cards.Card'>(1,'clubs'), <class 'cards.Card'>(2,'clubs'), <class 'cards.Card'>(3,'clubs'), <class 'cards.Card'>(4,'clubs'), <class 'cards.Card'>(5,'clubs')], 'spades': [<class 'cards.Card'>(1,'spades'), <class 'cards.Card'>(2,'spades'), <class 'cards.Card'>(3,'spades'), <class 'cards.Card'>(4,'spades'), <class 'cards.Card'>(5,'spades')], 'diamonds': [<class 'cards.Card'>(1,'diamonds'), <class 'cards.Card'>(2,'diamonds'), <class 'cards.Card'>(3,'diamonds'), <class 'cards.Card'>(4,'diamonds'), <class 'cards.Card'>(5,'diamonds')]}
^
SyntaxError: invalid syntax
我只是猜测这是因为 Card 类的表示方式。我试图用 {!r} 代替 {!s} 但它并没有改变它。我只是在考虑硬编码它属于 Card 类的事实,但我希望有一些特定的方式可以做到这一点。
解决:只需要在.__name__
后面加上self.__class__
并使用 {!s} (以便删除引号)而不是 {!r}