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Reference library

Lists & loops

Iterate, transform, and combine sequences with readable Python patterns.

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Lists & loops medium

List comprehension filter

Build a new list in one line by filtering and transforming items.

lists comprehension filter
Python 
numbers = [1, 2, 3, 4, 5, 6, 7, 8]
doubled_evens = [n * 2 for n in numbers if n % 2 == 0]
print(doubled_evens)

names = ["ada", "linus", "guido"]
title_case = [name.title() for name in names if name]
print(title_case)
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Strings & text 3 Lists & loops 3 Functions & basics 2 Files & data 2 Errors & debugging 2

Lists & loops — Python code examples

What you will find here

This page collects lists & loops snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

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