Use case of Python Set datatype

A Set in Python : A Set is an unordered collection data type that is iterable, mutable, and has no duplicate elements.

# Lets create a Dictionary, with its values as Set
cocktail = {
    'martini': {'vodka', 'vermouth'},
    'black russian': {'vodka', 'kahlua'},
    'white russian': {'cream', 'kahlua', 'vodka'},
    'manhattan': {'rye', 'vermouth', 'bitters'},
    'screwdriver':{'orange juice', 'vodka'}
}
# Que: Find all drinks which contain vodka
# Example of element present in a set
for (drink, contents) in cocktail.items():
    if 'vodka' in contents:
        print(drink)
Output:
martini
black russian
white russian
screwdriver
# Que: Find all drinks which have vodka , but not vermouth along with it
# Example of intersection
for drink, contents in cocktail.items():
    if 'vodka' in contents and not contents & {'vermouth'}:
        print(drink, " - ", contents)

Output:
black russian  -  {'kahlua', 'vodka'}
white russian  -  {'cream', 'kahlua', 'vodka'}
screwdriver  -  {'vodka', 'orange juice'}
# Find any drink that has vermouth or orange juice
for drink,contents in cocktail.items():
    if contents & {'vermouth', 'orange juice'}:
        print(drink, "-", contents)

Output:- 
martini - {'vermouth', 'vodka'}
manhattan - {'vermouth', 'bitters', 'rye'}
screwdriver - {'vodka', 'orange juice'}


# Find what all drinks needed if you want to serve martini and screwdriver
print(cocktail['martini'] | cocktail['screwdriver']);

Output:-
{'vermouth', 'orange juice', 'vodka'}


# If you have drinks needed for martini , find what all extra drinks are needed to make manhattan
cocktail['manhattan'] - cocktail['martini']

Output:
{'bitters', 'rye'}


# Find drinks which are not common in 'martini' and 'black russian'
print(cocktail['martini'] ^ cocktail['black russian'])

Output:
{'vermouth', 'kahlua'}



#Find all drinks which have atleast same contents as 'black russian'
for drink, contents in cocktail.items():
    if contents > cocktail['black russian']:
        print(drink, "-", contents)

Output:
white russian - {'cream', 'kahlua', 'vodka'}