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What is an Off-by-One Error in Python? (Explained for Kids!)

· 4 min read
Serhii Hrekov
Senior Software Engineer & System Architect specializing in Python, Web Systems, Cloud Infrastructure & Automation

Have you ever counted your toys and accidentally said you had 11, but really only had 10? That's kind of what an off-by-one error is in Python!

It's a tiny mistake where your program counts 1 too many or 1 too few. These mistakes are super common, even for professional programmers.