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tuple unpacking

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Code Mala Tang

Jun 8, 2025 · Fundamentals

Why Python’s a, b = b, a Isn’t Magic – The Real Mechanics Explained

This article demystifies Python’s a, b = b, a idiom by detailing how tuple packing and unpacking work, the exact evaluation order, the CPython bytecode implementation, comparisons with C, C++, Java, JavaScript, and the performance and memory implications of the technique.

BytecodePythonperformance

0 likes · 17 min read

Why Python’s a, b = b, a Isn’t Magic – The Real Mechanics Explained

IT Services Circle

Feb 7, 2022 · Fundamentals

Understanding Python’s a,b = b,a Variable Swap: Bytecode, Stack Operations, and Evaluation Order

This article explains how Python’s elegant a,b = b,a variable swap works under the hood by examining bytecode, stack manipulation with ROT_TWO, evaluation order nuances, and the differences when swapping more than two variables, providing clear code examples and interpreter insights.

BytecodeInterpreterPython

0 likes · 9 min read

Understanding Python’s a,b = b,a Variable Swap: Bytecode, Stack Operations, and Evaluation Order