列表列表，将所有字符串转换为 int，Python 3

问题描述

我正在尝试将大列表中小列表的所有元素转换为整数，所以它应该如下所示:

I am trying to convert all elements of the small lists in the big list to integers, so it should look like this:

current list:
list = [['1','2','3'],['8','6','8'],['2','9','3'],['2','5','7'],['5','4','1'],['0','8','7']]


for e in list:
    for i in e:
        i = int(i)

new list:
list = [[1,2,3],[8,6,8],[2,9,3],[2,5,7],[5,4,1],[0,8,7]]

谁能告诉我为什么这不起作用并向我展示一种有效的方法?谢谢！

Could anyone tell me why doesn't this work and show me a method that does work? Thanks!

推荐答案

你可以使用嵌套列表推导:

You can use a nested list comprehension:

converted = [[int(num) for num in sub] for sub in lst]

我也将list重命名为lst，因为list是列表类型的名称，不推荐用于变量名.

I also renamed list to lst, because list is the name of the list type and not recommended to use for variable names.

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