Find duplicates in an integer list using python

find_duplicates.py

#!/usr/bin/env python

from itertools import groupby

myList = [1, 2, 1, 3, 1]
for x, y in groupby(sorted(myList)):
    # groupby groups by consecutive elements which are similar
    # x is the element, y is the list which contains the elements occurence
    dup_list = list(y)
    print 'x : ' + str(x) + ', y: ' + str(list(dup_list))
    if (len(list(dup_list)) > 1):
        print str(x) + ' is present in the list ' + str(len(dup_list)) + ' times'

find_duplicates.py Output

x : 1, y: [1, 1, 1]
1 is present in the list 3 times
x : 2, y: [2]
x : 3, y: [3]