List Comprehensions

List comprehensions provide a concise way to create lists in Python.

Basic Syntax

# Traditional way
squares = []
for x in range(10):
    squares.append(x ** 2)

# List comprehension
squares = [x ** 2 for x in range(10)]

With Conditionals

# Even numbers only
evens = [x for x in range(20) if x % 2 == 0]

# Even/odd labels
labels = ["even" if x % 2 == 0 else "odd" for x in range(5)]

String Comprehensions

names = ["alice", "bob", "charlie"]
capitalized = [name.upper() for name in names]