python - 创建具有负值排列的列表

Question

任何人都可以帮助创建给定列表中具有负值的列表吗？

例如:

values = [1, 2, 3]

期望的输出是

[[-1, 2, 3], [1, -2, 3], [1, 2, -3],[-1, -2, 3], [1, -2, -3], [-1, 2, -3], [-1, -2, -3]]

Answer 1

生成 3 倍 [1, -1] 的乘积，并将结果与​​输入列表相乘:

from itertools import product

values = [1, 2, 3]
[[num * mul for num, mul in zip(values, combo)]
 for combo in product([1, -1], repeat=len(values))]

演示:

>>> from itertools import product
>>> values = [1, 2, 3]
>>> [[num * mul for num, mul in zip(values, combo)] for combo in product([1, -1], repeat=len(values))]
[[1, 2, 3], [1, 2, -3], [1, -2, 3], [1, -2, -3], [-1, 2, 3], [-1, 2, -3], [-1, -2, 3], [-1, -2, -3]]

输出顺序与您指定的略有不同，但会生成相同的值，加上原始列表作为第一个元素。