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 Python Collections (2016, retired 2019) Sets Set Math

Posted by ds1
ds1
7,627 Points

Question on Sets

At the end of the video, Kenneth mentions that with the exception of union and symmetric difference, order matters. However, order wouldn't matter for intersection, would it? (Seems like order only matters for difference.)

2 Answers

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,720 Points
Jeff Muday
Jeff Muday
Treehouse Moderator 28,720 Points

You are correct, order should not matter for intersection.

Here is a stack overflow link that shows an example of the "gotcha" that can happen when you do a set difference (-) rather that the symmetric_difference.

https://stackoverflow.com/questions/3462143/get-difference-between-two-lists

ds1
ds1
7,627 Points
ds1
ds1
7,627 Points

Thanks, Jeff!