在python的嵌套列表中查找元素的索引 [英] Finding the index of an element in nested lists in python

问题描述

我正在尝试获取python嵌套列表中元素的索引-例如[[a, b, c], [d, e, f], [g,h]](并非所有列表的大小均相同). 我尝试使用

I am trying to get the index of an element in nested lists in python - for example [[a, b, c], [d, e, f], [g,h]] (not all lists are the same size). I have tried using

strand_value= [x[0] for x in np.where(min_value_of_non_empty_strands=="a")]

但这仅返回一个空列表，即使存在该元素也是如此.知道我在做什么错吗?

but this is only returning an empty list, even though the element is present. Any idea what I'm doing wrong?

推荐答案

def find_in_list_of_list(mylist, char):
    for sub_list in mylist:
        if char in sub_list:
            return (mylist.index(sub_list), sub_list.index(char))
    raise ValueError("'{char}' is not in list".format(char = char))

example_list = [['a', 'b', 'c'], ['d', 'e', 'f'], ['g', 'h']]

find_in_list_of_list(example_list, 'b')
(0, 1)

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