用两个列表中的每个值的行创建列表/矩阵

Question

假设您有2个唯一值列表，那么如何创建具有每个值记录的列表/数据框/数组。

list_1 = [1, 2, 3, 4]
list_2 = ['one', 'two', 'three', 'four']

expected = [
    [1, 'one'],
    [2, 'one'],
    [3, 'one'],
    [4, 'one'],
    ...
    [1, 'four'],
    [2, 'four'],
    [3, 'four'],
    [4, 'four']
]

Answer 1

您可以使用列表理解：

[[i,j] for i in list_1 for j in list_2]

输出：

[[1, 'one'],
 [1, 'two'],
 [1, 'three'],
 [1, 'four'],
 [2, 'one'],
 [2, 'two'],
 [2, 'three'],
 [2, 'four'],
 [3, 'one'],
 [3, 'two'],
 [3, 'three'],
 [3, 'four'],
 [4, 'one'],
 [4, 'two'],
 [4, 'three'],
 [4, 'four']]

或者您可以使用itertools.product来获取元组列表：

import itertools
list(itertools.product(list_1, list_2))

输出：

[(1, 'one'),
 (1, 'two'),
 (1, 'three'),
 (1, 'four'),
 (2, 'one'),
 (2, 'two'),
 (2, 'three'),
 (2, 'four'),
 (3, 'one'),
 (3, 'two'),
 (3, 'three'),
 (3, 'four'),
 (4, 'one'),
 (4, 'two'),
 (4, 'three'),
 (4, 'four')]