Generators

A generator function uses yield. Each yield pauses the function and hands a value to the caller. The next iteration resumes right where it left off.

Why it matters

• Memory: process a billion items without holding them all
• Composition: pipelines of yield are tiny and readable

Generator expression

(expr for x in seq) — like a list comprehension but lazy.

Try it

1. Write a generator that yields the first n square numbers.
2. Use a generator expression with max(...) to find the longest word in a list.