Python Sets
A set is an unordered collection of unique elements written with curly braces {}. Duplicates are automatically removed. Sets are mutable but can only contain immutable items.
Creating Sets
Use curly braces or the set() constructor.
fruits = {"apple", "banana", "cherry", "apple"}
print(fruits)
empty_set = set()Set Operations
Union, intersection, difference, and symmetric difference.
a = {1, 2, 3, 4}
b = {3, 4, 5, 6}
print(a | b)
print(a & b)
print(a - b)
print(a ^ b)Set Methods
Useful methods: add(), remove(), discard(), pop(), clear().
nums = {10, 20, 30}
nums.add(40)
nums.discard(20)
removed = nums.pop()
print(nums)
print(f"Removed: {removed}")