Grouping two lists of filenames using string match

I have list of files ‘L1’ as follows:

L1 = ['D://carrot_25kg', 'D://banana_5kg', 'D://apple_50kg']

I have another list of files ‘L2’ as follows:

L2 = ['D://box3_5kg', 'D://box1_25kg', 'D://box2_50kg']

I needed to group files as follows.

result = [['D://carrot_25kg', 'D://box1_25kg'],
          ['D://banana_5kg', 'D://box3_5kg'],
          ['D://apple_50kg', 'D://box1_50kg']] #the order is not important

It is to match based on "_xxkg" string.
How can I do it guys?

>Solution :

You are grouping by a suffix, let’s use a dictionary:

d = {
    path.split('_')[-1]: [path]
    for path in L1
}

for path in L2:
    suffix = path.split('_')[-1]
    d[suffix] = d.get(suffix, [])
    d[suffix].append(path)

list(d.values())
[['D://carrot_25kg', 'D://box1_25kg'],
 ['D://banana_5kg', 'D://box3_5kg'],
 ['D://apple_50kg', 'D://box2_50kg']]

Or, using a defaultdictionary:

from collections import defaultdict
from itertools import chain


d = defaultdict(list)

for path in chain(L1, L2):
    suffix = path.split('_')[-1]
    d[suffix].append(path)

list(d.values())
[['D://carrot_25kg', 'D://box1_25kg'],
 ['D://banana_5kg', 'D://box3_5kg'],
 ['D://apple_50kg', 'D://box2_50kg']]