Sets

Unordered list of unique elements

my_set = {1, 2, 3, 4, 5}
print(my_set)
print(type(my_set))

{1, 2, 3, 4, 5}

print("Unique elements in a list")
numbers = [1, 2, 3, 3, 4, 5, 5, 6]
set(numbers)

Unique elements in a list

{1, 2, 3, 4, 5, 6}

my_set = {1, 2, 3, 4, 5}
my_set.add(6)
print(my_set)

{1, 2, 3, 4, 5, 6}

my_set = {1, 2, 3, 4, 5}
my_set.remove(5)  # This will raise an error if 5 is not present
print(my_set)

{1, 2, 3, 4}

my_set = {1, 2, 3, 4, 5}
my_set.discard(6)  # This won't raise an error if 6 is not present
print(my_set)

{1, 2, 3, 4, 5}

my_set = {1, 2, 3, 4, 5}
print(my_set.pop())  # This will remove the first inserted element FIFO
print(my_set)

1

{2, 3, 4, 5}

my_set = {1, 2, 3, 4, 5}
my_set.clear()
print(my_set)  # This will print an empty set

set()

print("Check if an element is in the set")
my_set = {1, 2, 3, 4, 5}
print(3 in my_set)

Check if an element is in the set

True

print("Union of two sets")
set1 = {1, 2, 3, 4, 5, 6}
set2 = {4, 5, 6, 7, 8, 9}
print(set1.union(set2))

Union of two sets

{1, 2, 3, 4, 5, 6, 7, 8, 9}

print("Intersection of two sets")
set1 = {1, 2, 3, 4, 5, 6}
set2 = {4, 5, 6, 7, 8, 9}
intersection_set = set1.intersection(set2)
print(intersection_set)

Intersection of two sets

{4, 5, 6}

print("Update set1 with the intersection of set1 and set2")
set1 = {1, 2, 3, 4, 5, 6}
set2 = {4, 5, 6, 7, 8, 9}
set1.intersection_update(set2)
print(set1)

Update set1 with the intersection of set1 and set2

{4, 5, 6}

print("Difference of two sets")
set1 = {1, 2, 3, 4, 5, 6}
set2 = {4, 5, 6, 7, 8, 9}
set1.difference(set2)

Difference of two sets

{1, 2, 3}

print("Symmetric difference of two sets")
set1 = {1, 2, 3, 4, 5, 6}
set2 = {4, 5, 6, 7, 8, 9}
set1.symmetric_difference(set2)

Symmetric difference of two sets

{1, 2, 3, 7, 8, 9}

print("are all set1 elements present in set2?")
set1 = {1, 2, 3}
set2 = {3, 4, 5}
set1.issubset(set2)

are all set1 elements present in set2?

False

print("are all set2 elements present in set1?")
set1 = {1, 2, 3}
set2 = {3, 4, 5}
set1.issuperset(set2)

are all set2 elements present in set1?

False