Track 4 · Lesson 2 of 11

range() in depth: start, stop and step

Control exactly which numbers a for loop visits with range(start, stop, step), count down, and avoid off-by-one errors.

You will be able to

• Use range(start, stop) to count from any starting number
• Use a step to skip values or count backwards
• Explain why the stop value is never included
• Spot and fix off-by-one errors in loops