如何确定列表具有的列表层数? [英] How to determine the number of layers of lists a list has?

问题描述

鉴于列表可以在列表内，列表可以在列表内的列表内，依此类推，我想知道列表内另一个列表内的列表数量.

Given that a list can be within a list, and list can be within a list within a list, and so forth, I'd like to know the number of lists that exist within another list within a list.

例如，

l1 = [1] #1 is within 1 list
l2 = [[1]] #1 is within 2 lists 
l3 = [[[1]]] #1 is within 3 lists
l4 = [[[[1]]]] #1 is within 4 list

我想知道l1的深度为1个列表，l2的深度为2个列表，l3的深度为3个列表，依此类推.

I'd like to know that l1 is 1 list deep, l2 is 2 lists deep, l3 is 3 lists deep and so forth.

推荐答案

假设像您的示例一样，它是嵌套列表的简单结构，您可以简单地计算括号内的数字:)

Assuming it's a simple structure of nested lists like your examples, you can simply count the number opening brackets :)

l4 = [[[[1]]]]
print len(str(l4)) - len(str(l4).replace('[', '')) # 4

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