Find duplicate elements in a list

There is a list, find the repeated elements in the list, such as list1 = [1,2,4,3,6,4]

　method one,

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

 

 

　Method 2, Counter()

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