python - 创建不同列表的元组列表

Question

假设我有以下三个列表（l1、l2、l3）。如何创建一个新列表，其中每个元素都是列表元素的元组（l_desired）？它实际上是 python 中 zip 方法的扩展版本。

简而言之，给定l1, l2, l3，我该如何创建l_desired？

l1 = [1,2,3]
l2 = ['a', 'b', 'c']
l3 = ['Jess', 'Muss']

l_desiered = [(1, 'a', 'Jess'), (1, 'b', 'Jess'), (1, 'c', 'Jess'), 
              (1, 'a', 'Muss'), (1, 'b', 'Muss'), (1, 'c', 'Muss'), 
              (2, 'a', 'Jess'), (2, 'b', 'Jess'), (2, 'c', 'Jess'), ...]

`

标签： pythonzip

Answer 1

正如其他人已经说过的，使用itertools.product()：

>>> l1 = [1,2,3]
>>> l2 = ['a', 'b', 'c']
>>> l3 = ['Jess', 'Muss']
>>> list(itertools.product(l1, l2, l3))
[(1, 'a', 'Jess'), (1, 'a', 'Muss'), (1, 'b', 'Jess'), (1, 'b', 'Muss'), (1, 'c', 'Jess'), (1, 'c', 'Muss'), (2, 'a', 'Jess'), (2, 'a', 'Muss'), (2, 'b', 'Jess'), (2, 'b', 'Muss'), (2, 'c', 'Jess'), (2, 'c', 'Muss'), (3, 'a', 'Jess'), (3, 'a', 'Muss'), (3, 'b', 'Jess'), (3, 'b', 'Muss'), (3, 'c', 'Jess'), (3, 'c', 'Muss')]

要实现问题中指定的排序顺序，您可以对结果进行如下排序：

>>> from operator import itemgetter
>>> sorted(itertools.product(l1, l2, l3), key=itemgetter(0,2,1))
[(1, 'a', 'Jess'), (1, 'b', 'Jess'), (1, 'c', 'Jess'), (1, 'a', 'Muss'), (1, 'b', 'Muss'), (1, 'c', 'Muss'), (2, 'a', 'Jess'), (2, 'b', 'Jess'), (2, 'c', 'Jess'), (2, 'a', 'Muss'), (2, 'b', 'Muss'), (2, 'c', 'Muss'), (3, 'a', 'Jess'), (3, 'b', 'Jess'), (3, 'c', 'Jess'), (3, 'a', 'Muss'), (3, 'b', 'Muss'), (3, 'c', 'Muss')]