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