Removing the first element of a list within a list of a list-CodePudding

I want to remove the first index of each list within a list of a list. And create one list for each list within the list as shown below. E.g my output is:

List = [[[0.75, 4], [0.43, 2], [0.29, 1], [0.03, 3]], [[0.77, 4], [0.77, 3], [0.55, 1], [0.45, 2]]]

And I want the output to be:

newList = [[4,2,1,3], [4,3,1,2]]

Im getting confused due to the list within a list of a list.

CodePudding user response：

Try nested list comprehension:

newList = [[elements[1] for elements in nested] for nested in List]

The inner list comprehension takes the second element of the list (elements), the outer does this for all the outer lists.

CodePudding user response：

One way to be more clear to you what is happening would be as follows:

new_list = []
for outer_item in List:
    inner_list = []
    for inner_item in outer_item:
        inner_list.append(inner_item[1])
    new_list.append(inner_list)

output of new_list = [[4, 2, 1, 3], [4, 3, 1, 2]]