Python列表推导-转置 [英] Python List Comprehensions - Transposing

问题描述

我只是通过阅读此处的矩阵转置教程.我理解了这个示例，但是我试图找到一种无需对范围进行硬编码即可转置矩阵的方法.

I'm just starting out with list comprehensions by the reading the matrix transposing tutorial here. I understand the example, but I'm trying to figure out a way to transpose the matrix without hardcoding the range in.

matrix = [
    [1,2,3,4],
    [5,6,7,8],
    [9,10,11,12]
]

lcomp = [[row[i] for row in matrix] for i in range(4)]
print(lcomp)

[[1, 5, 9], [2, 6, 10], [3, 7, 11], [4, 8, 12]] #result

而不是range(4)，我希望它能够找出最大的嵌套数组具有的最大元素数.我尝试放置lambda，但不断从中获取错误.可以单线执行此操作吗?

Instead of range(4), I want it to be able to figure out the the max number of elements that the largest nested array has. I tried placing a lambda but kept getting errors from it. Is it possible to do this in a one-liner?

推荐答案

您可以使用另一种理解方式！他们是一个非常强大的工具.

You can use another comprehension! They're a very powerful tool.

[[row(i) for row in matrix] for i in range(max(len(r) for r in matrix))]

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