Python列表和for循环
Python列表和for循环
提问于 2015-01-26 17:37:39
我期待着这段代码打印出铲子:一个铲子:2等等，直到心:K。
但它只做心:A到心:K。
我怎么发动汽车呢？
symbols = ["spade", "clover", "diamond", "heart"]
numbers = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"]
cards = {}
for num in numbers:
for symbol in symbols:
cards[num] = symbol
print cards回答 3
Stack Overflow用户
回答已采纳
发布于 2015-01-27 18:58:37
使用您的itertools工具箱
import itertools
symbols = ["spade", "clover", "diamond", "heart"]
numbers = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"]
combinations = itertools.product(symbols, numbers)
cards = ["{}:{}".format(suit, rank) for suit,rank in combinations]这会给你一个清单：
['spade:A',
'spade:2',
'spade:3',
'spade:4',
'spade:5',
'spade:6',
'spade:7',
'spade:8',
'spade:9',
'spade:10',
'spade:J',
'spade:Q',
'spade:K',
'clover:A',
'clover:2',
'clover:3',
'clover:4',
'clover:5',
'clover:6',
'clover:7',
'clover:8',
'clover:9',
'clover:10',
'clover:J',
'clover:Q',
'clover:K',
'diamond:A',
'diamond:2',
'diamond:3',
'diamond:4',
'diamond:5',
'diamond:6',
'diamond:7',
'diamond:8',
'diamond:9',
'diamond:10',
'diamond:J',
'diamond:Q',
'diamond:K',
'heart:A',
'heart:2',
'heart:3',
'heart:4',
'heart:5',
'heart:6',
'heart:7',
'heart:8',
'heart:9',
'heart:10',
'heart:J',
'heart:Q',
'heart:K']Stack Overflow用户
发布于 2015-01-27 12:10:42
问题是，您没有以正确的方式迭代，因此没有在列表中追加。正确的方法是
symbols = ["spade", "clover", "diamond", "heart"]
numbers = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"]
cards = []
for j in range(len(symbols)):
for i in range(len(numbers)):
cards.append(str(symbols[j]+':'+str(numbers[i])))
print cards产出：
['spade:A', 'spade:2', 'spade:3', 'spade:4', 'spade:5', 'spade:6', 'spade:7', 'spade:8',
'spade:9', 'spade:10', 'spade:J', 'spade:Q', 'spade:K', 'clover:A', 'clover:2',
'clover:3', 'clover:4', 'clover:5', 'clover:6', 'clover:7', 'clover:8', 'clover:9',
'clover:10', 'clover:J', 'clover:Q', 'clover:K', 'diamond:A', 'diamond:2', 'diamond:3',
'diamond:4', 'diamond:5', 'diamond:6', 'diamond:7', 'diamond:8', 'diamond:9', 'diamond:10',
'diamond:J', 'diamond:Q', 'diamond:K', 'heart:A', 'heart:2', 'heart:3', 'heart:4',
'heart:5', 'heart:6', 'heart:7', 'heart:8', 'heart:9', 'heart:10', 'heart:J', 'heart:Q', 'heart:K']用python2.7中的Ipython笔记本制作
希望能帮上忙。
Stack Overflow用户
发布于 2015-01-26 17:46:21
您正在很好地迭代符号，但是当您遍历第二个循环中的数字时，您实际上是在替换由前一个循环设置的值，因此您只有最后一个循环中的值，并且所有的值都被替换了。这意味着卡“A”值在循环中设置了4次，而“心”的最后一个值被保留。同样的情况也发生在所有其他索引中。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28155547
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