python中如何按照长的相加两个列表

l1 = [11, 2, 3]
l2 = [5, 3]


def _map(l1, l2):
   l1_length = len(l1)
   l2_length = len(l2)
   min_lengt = min(l1_length, l2_length)
   for x in range(min_lengt):
      yield l1[x] + l2[x]

   if l1_length < l2_length:
      temp = l2[min_lengt:]
      for t in temp:
         yield t
   if l2_length < l1_length:
      temp = l1[min_lengt:]
      for t in temp:
         yield t


ret = _map(l1, l2)
print(list(ret))