Python · Functions

lambda

A small anonymous function. Use it for short keys, not for named logic.

pythonRunnable example python course

Syntax

lambda x: x * 2

Example

Open in the lab

items = ["ccc", "a", "bb"]
print(sorted(items, key=lambda value: len(value)))

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