# A set is a collection which is unordered and unindexed. no duplicate members.
# create set
fruits_set = {'apples', 'oranges', 'mango'}
# check if in set
print ('apples' in fruits_set)
# add to set
fruits_set.add ('grape')
# remove from set
fruits_set.remove ('grape')
# add duplicate 
fruits_set.add ('apples')
# clear set 
fruits_set.clear()
# delete
# del fruits_set
print (fruits_set)