How to debug a Python loop-condition bug

Quick Overview

This question evaluates debugging skills and understanding of loop termination and control-flow correctness in Python, emphasizing practical familiarity with debugging tools and techniques for isolating faulty loop conditions.

How to debug a Python loop-condition bug

Company: Apple

Role: Software Engineer

Category: Software Engineering Fundamentals

Difficulty: medium

Interview Round: Technical Screen

You are given a Python script that appears to hang or produce incorrect results because of a bug in a loop condition (e.g., `while`/`for` termination logic). Explain how you would debug it systematically to find the faulty loop condition and fix it. Include what tools/techniques you would use (prints, logging, debugger, unit tests) and what common loop-condition mistakes you would check for.

Overview: This question evaluates debugging skills and understanding of loop termination and control-flow correctness in Python, emphasizing practical familiarity with debugging tools and techniques for isolating faulty loop conditions.

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Mar 6, 2026
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You are given a Python script that appears to hang or produce incorrect results because of a bug in a loop condition (e.g., while/for termination logic).

Explain how you would debug it systematically to find the faulty loop condition and fix it. Include what tools/techniques you would use (prints, logging, debugger, unit tests) and what common loop-condition mistakes you would check for.

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