python列表推导式的结构探究

from collections import Counter

def filter_unique(lst):

  temp_list = []

  for item, count in Counter(lst).items():

    if count > 1:

      temp_list.append(item)

  return temp_list

# EXAMPLES

filter_unique([1, 2, 2, 3, 4, 4, 5]) # [2, 4]