10 Python Function Mistakes Junior Developers Make

Published: 06 June 2026
on channel: Dev Level Up

Functions look simple in Python, but they are also one of the easiest places to create confusing bugs. In this video, we break down 10 real Python function mistakes that beginner and junior developers make all the time. You will see broken code first, understand why it fails, and then compare it with the fixed version.

We will cover common problems with return values, default arguments, variable scope, parameter order, naming, mutable data, missing calls, and more. These examples are practical, interview-friendly, and designed to help you recognize bugs faster in your own code.

If you are learning Python, preparing for your first developer job, or trying to write cleaner code, this video will help you level up your debugging skills.

#python #pythontutorial #coding #programming #debugging #learntocode

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