Quick Answer

Perform mathematical set operations in Python.

Understanding the Issue

Sets store unique elements and support mathematical set operations like union, intersection, difference, and symmetric difference. Useful for removing duplicates, membership testing, and comparative operations between collections.

The Problem

This code demonstrates the issue:

Python Error 
A = {1, 2, 3}
B = {3, 4, 5}
# Need common elements and unique elements

The Solution

Here's the corrected code:

Python Fixed 
# Intersection (common elements)
common = A & B  # {3}

# Union (all unique elements)
all_items = A | B  # {1,2,3,4,5}

# Remove duplicates from list
unique = list(set([1,2,2,3]))  # [1,2,3]

Key Takeaways

Use sets for efficient uniqueness operations.