Set Methods

# 1. Add, remove, discard, pop
fruits = {'apple', 'pear', 'banana', 'tomato', 'strawberry', 'apricot'}
print(fruits)
fruits.add('pineapple')
fruits.add('mango')
fruits.add('berry')
print(fruits, '\n')

# Remove vs discard
fruits.remove('pear')
print(fruits)
fruits.discard('strawberry')
print(fruits, '\n')

# 'Remove' is the exact same method as 'discard', but 'remove' method will RAISE AN ERROR if the specified item DOES NOT EXIST, while 'discard' won't do so
fruits.discard('orange')
print(fruits)
print(fruits.discard('orange'), '\n')

# Pop removes a RANDOM item
fruits.pop()
print(fruits, '\n')



# 2. Union, intersection, intersection_update
fruits = {'apple', 'pear', 'banana', 'berry', 'melon', 'watermelon'}
exotics = {'mango', 'pineapple', 'watermelon', 'passion fruit'}
union = fruits.union(exotics)
print(union)
intersection = fruits.intersection(exotics)
print(intersection)
fruits.intersection_update(exotics)
print(fruits)



# 3. Update, difference
fruits = {"apple", "banana", "cherry"}
companies = {"google", "microsoft", "apple"}

diff1 = fruits.difference(companies)
print(diff1)
diff2 = companies.difference(fruits)
print(diff2, '\n')

symm_diff = companies.symmetric_difference(fruits)
diff = diff1.union(diff2)
print(symm_diff, diff == symm_diff, '\n')

fruits.update(companies)
print(fruits)



# 4. Subset, superset
letters = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}
vowels = {'a', 'e', 'i', 'o', 'u'}
print(vowels.issubset(letters))
print(letters.issuperset(vowels), '\n')

print(vowels.issuperset(vowels))
print(letters.issuperset(vowels), '\n')

print(letters.issuperset({}))
print(letters.issubset({}))



# 5. Disjoint
# Returns True if no items in set x is present in set y:

x = {"apple", "banana", "cherry"}
y = {"google", "microsoft", "facebook"}
z = x.isdisjoint(y)
print(z)