Python · Iterators, modules and the standard library

Generator expression

A lazy version of a comprehension. It uses constant memory.

pythonRunnable example python course

Syntax

(expr for item in iterable)

Example

Open in the lab

total = sum(n * n for n in range(1000))
print(total)

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.