[英]Improving a List Comprehension
下面的列表理解实现了预期的结果/输出:
代码(纸牌玩具示例):
Suits = ["Hearts"]*3 +["Diamonds"]*3
Names = ["Two","Ten","King"]
z = [(i,Names[(i-1)%3],Suits[((i-1)%6)]) for i in range(1,7)]
Output z:
[(1, 'Two', 'Hearts'),
(2, 'Ten', 'Hearts'),
(3, 'King', 'Hearts'),
(4, 'Two', 'Diamonds'),
(5, 'Ten', 'Diamonds'),
(6, 'King', 'Diamonds')]
它起作用是因为原始的Suits
列表从["Hearts","Diamonds"] to["Hearts"]*3 +["Diamonds"]*3.
这感觉做作; 虽然它有效,但我正在寻找更好的解决方案。
使用enumerate
和itertools.product
:
from itertools import product
ranks = ["Two", "Ten", "King"]
suits = ["Hearts", "Diamonds"]
z = [(i, r, s) for i, (s, r) in enumerate(product(suits, ranks), start=1)]
Output:
[(1, 'Two', 'Hearts'),
(2, 'Ten', 'Hearts'),
(3, 'King', 'Hearts'),
(4, 'Two', 'Diamonds'),
(5, 'Ten', 'Diamonds'),
(6, 'King', 'Diamonds')]
您可以使用itertools.product
和enumerate
:
from itertools import product
suits = ["Hearts", "Diamonds"]
sames = ["Two","Ten","King"]
cards = [(index, suit, rank) for index, (suit, rank) in enumerate(product(sames, suits), start=1)]
print(cards)
您可以使用带有枚举的两级嵌套理解来获得编号:
Suits = ["Hearts","Diamonds"]
Names = ["Two","Ten","King"]
r = [(j+i,n,s) for j,s in enumerate(Suits)
for i,n in enumerate(Names,j*len(Suits)+1) ]
print(*r,sep="\n")
(1, 'Two', 'Hearts')
(2, 'Ten', 'Hearts')
(3, 'King', 'Hearts')
(4, 'Two', 'Diamonds')
(5, 'Ten', 'Diamonds')
(6, 'King', 'Diamonds')
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