Python Bytecode Explained Visually Line by Line (dis module).

Publicado em: 11 Janeiro 2026
no canal de: code with mdns
109
9

Python does not run your source code directly. CPython converts it into bytecode, and that bytecode is what actually executes.

In UNDER 4 minutes, you will learn how to read Python bytecode using the built-in dis module and understand each instruction using the execution stack (push and pop). After that, I show why this matters for debugging and performance.

What you will learn:

How to use dis to see the exact bytecode CPython runs

How stack-based execution works (push values, pop values)

How instructions like LOAD_CONST, STORE_NAME, LOAD_NAME, BINARY_OP, CALL, POP_TOP work

Why PUSH_NULL exists in function calls

How bytecode helps with debugging surprising behavior

How bytecode helps you reason about performance by comparing instruction counts

Timestamps
0:00 Python does not run your source code directly
0:12 Using the dis module to print bytecode
0:44 Understanding Bytecode line by line
3:00 Why dis exists: learning, performance, debugging


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