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![](https://ecs-static.teamtreehouse.com/assets/views/marketing/shared/community-banner-white-47072046c51352fe6a69f5e691ff5700b28bb11d45197d7bdf066d9ea3f72d0c.webp)
![nicolaspeterson](https://secure.gravatar.com/avatar/6c18deecf88caaae99415156be044183?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
nicolaspeterson
8,569 PointsIs index a built in feature of Python?
How does the interpreter know what index is referring to? Is this a built in feature that automatically points to an object's position in a sequence?
1 Answer
![Joseph Yhu](https://uploads.teamtreehouse.com/production/profile-photos/10742228/micro_121009504_105928134617925_5772733173913238661_n.jpg)
Joseph Yhu
PHP Development Techdegree Graduate 48,637 PointsNo it's just a variable.
This line: index = 1
, declares the variable and sets it to 1. So the first time through the loop, the printed string would be 1. roast beef
. This line: index+=1
increments the index variable by 1, so the next time through the loop the printed string would be 2. cucumbers
. And so on until we looped through all the items in the groceries list.
nicolaspeterson
8,569 Pointsnicolaspeterson
8,569 PointsGot it, thanks!