Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python

A question about built in functions in python!

How do the "any()" and "all()" functions work? I know that they are meant to just return either true or false. But do they work? What is their purpose? Let me know ;)

2 Answers

Steven Parker
Steven Parker
243,318 Points

These are both used with iterables (like lists).

The any function will return True if any item in the iterable is "truthy". If there are no "truthy" items it will return False.

The all function will return True if every item in the iterable is "truthy". It will also return True if the iterable is empty.

Examples:

x = any([True, False])   # x will be True
y = all([True, False])   # y will be False

Thanks a ton! ;)