求列表中的重复元素

有一个列表，求出列表中重复元素，如 list1 = [1,2,4,3,6,4]

　方法一、

list1 = [1,2,4,3,6,4]
myset = set(list1)
for each in myset:
    print each,list1.count(each)

　方法二、Counter()

list1 = [1,2,4,3,6,4]
from collections import Counter
c = Counter(list1)