create a dictionary from the lists based on string match

I have two list of files as follows:

L3 = ['D://carrot_25kg', 'D://banana_5kg', 'D://apple_50kg']
L4 = ['D://box3_5kg-mark', 'D://box1_25kg-dan', 'D://box2_50kg-jack']

I needed to group files as follows.

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

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

from collections import defaultdict
from itertools import chain    

d = defaultdict(list)

for path in chain(L3, L4):
    suffix = path.split('_')[-1]
    d[suffix].append(path)

the result is unexpected.

defaultdict(<class 'list'>, {'25kg': ['D://carrot_25kg'], '5kg': ['D://banana_5kg'], '50kg': ['D://apple_50kg'], '5kg-mark': ['D://box3_5kg-mark'], '25kg-dan': ['D://box1_25kg-dan'], '50kg-jack': ['D://box2_50kg-jack']})

>Solution :

You’re not removing the -xxxx part when you form the dictionary key. Use

suffix = path.split('_')[-1].split('-')[0]