python列表的加法_Python列表加法理解
我是Python新⼿，不能将函数转换为列表理解。理解涉及value函数，其包含类如下：class Card(object):
# Lists containing valid candidates for a card's rank and suit.
python新手函数
suits = [None, "spade", "club", "heart", "diamond"]
ranks = [None, "ace", "two", "three", "four", "five", "six",
"seven", "eight", "nine", "ten", "jack", "queen", "king"]
# Dictionary containing the ranks and their associative values.
values = {None:0, "ace":1, "two":2, "three":3, "four":4,
"five":5,"six":6,"seven":7, "eight":8,"nine":9,
"ten":10, "jack":10, "queen":10, "king":10}
def __init__(self, rank=None, suit=None):
"""Constructor."""
if rank not in self.ranks:
raise ValueError("Invalid rank.")
if suit not in self.suits:
raise ValueError("Invalid suit.")
self.rank = rank
self.suit = suit
def __str__(self):
"""A string representation of the Card."""
return "{0}:{1}".format(self.rank, self.suit)
另⼀个类创建卡⽚对象列表，并定义以下函数：
^{pr2}$
据我所见，value函数是列表理解的候选函数，但我⽆法使其⼯作。我相信下⾯的内容是正确的，但是我仍然会遇到语法错误，我不知道我做错了什么。请注意，我是Python新⼿，并列出理解：def value(self):
result = [x += y for x = Card.values[y.rank] for y in self.cards]

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