出个题目

mswsg

生成的组合

1. a =(1,2,3)
   
2. b = (2,3,4)
   
3. c = (0,1,2)
   
4. [(2,x,y,z) for x in a for y in b for z in c ]

复制代码

[(2, 1, 2, 0),
(2, 1, 2, 1),
(2, 1, 2, 2),
(2, 1, 3, 0),
(2, 1, 3, 1),
(2, 1, 3, 2),
(2, 1, 4, 0),
(2, 1, 4, 1),
(2, 1, 4, 2),
(2, 2, 2, 0),
(2, 2, 2, 1),
(2, 2, 2, 2),
(2, 2, 3, 0),
(2, 2, 3, 1),
(2, 2, 3, 2),
(2, 2, 4, 0),
(2, 2, 4, 1),
(2, 2, 4, 2),
(2, 3, 2, 0),
(2, 3, 2, 1),
(2, 3, 2, 2),
(2, 3, 3, 0),
(2, 3, 3, 1),
(2, 3, 3, 2),
(2, 3, 4, 0),
(2, 3, 4, 1),
(2, 3, 4, 2)]
然后再filter？

mswsg

哈哈,这套题，我猜考python里的列表解析，map，filter 等函数，结合好了一行代码搞定回复 8# rubyish