Remove leading and trailing zeros from multidimensional list in Python [closed]

Question

I have a list such as:

my_list = [[1,2,2,1], [0,0,1,2], [1,2,0,0], [1,0,0,1]]

I need to remove only the leading and trailing zeros from the inner lists, so that I end up with:

new_list = [[1,2,2,1], [1,2], [1,2], [1,0,0,1]]

Any help much appreciated.

Answer 1

for sub_list in my_list:
    for dx in (0, -1):
        while sub_list and sub_list[dx] == 0:
            sub_list.pop(dx)