Can you explain the internal structure and operation of sets in Python?

In Python, a set (set) is implemented as a hash table that stores unique elements without a specific order.

Main features of its internal structure:

• Hash table: Each element is hashed, and its hash is used to determine its position in the array.
• Uniqueness: When adding a new element, a check is performed to see if an element with the same value already exists in the table, to avoid duplicates.
• Dynamic resizing: When the table is filled above a certain threshold, it is resized to maintain performance.

Example of using a set:

s = set()
s.add(1)
s.add(2)
s.add(1)  # will not be added again, as 1 already exists
print(s)  # Outputs {1, 2}

Thus, operations like adding, removing, and checking for the presence of an element are performed on average in O(1) time due to hashing.