Сравнение 2-ух списков в python
Найти общие элементы `common_items` списка `my_list1` и списка `my_list2` 

count_values_l1 = Counter(my_list1)\n
count_values_l2 = Counter(my_list2)\n
keys1 = count_values_l1.keys()\n
keys2 = count_values_l2.keys()\n
common_items = []\n
for key in keys1:\n
\tif key in keys2:\n
\t\tcommon_items += [key] * min(count_values_l1[key], count_values_l2[key])