Python · Syntax and control flow

Walrus operator

Assigns and tests in one expression. Use it to avoid computing a value twice.

pythonRunnable example python course

Syntax

if (n := len(items)) > 2:

Example

Open in the lab

values = [1, 2, 3]
if (count := len(values)) > 2:
    print(f"{count} values")

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