l=[1,2,3,4,5,2,3,4,7,9,5]
l1=[]
for i in l:
if i not in l1:
l1.append(i)
else:
print(i,end=' ')lst = [ 3, 6, 9, 12, 3, 30, 15, 9, 45, 36, 12, 12]
dupItems = []
uniqItems = {}
for x in lst:
if x not in uniqItems:
uniqItems[x] = 1
else:
if uniqItems[x] == 1:
dupItems.append(x)
uniqItems[x] += 1
print(dupItems)# program to print duplicate numbers in a given list
# provided input
list = [1, 2, 1, 2, 3, 4, 5, 1, 1, 2, 5, 6, 7, 8, 9, 9]
new = [] # defining output list
# condition for reviewing every
# element of given input list
for a in list:
# checking the occurrence of elements
n = list.count(a)
# if the occurrence is more than
# one we add it to the output list
if n > 1:
if new.count(a) == 0: # condition to check
new.append(a)
print(new)