Satori Komeiji's Programming Classroom

Nov 19, 2024 · Fundamentals

How Python Calls Functions Under the Hood

This article explains the low‑level mechanics of Python function calls, distinguishing Python‑implemented and C‑implemented functions, dissecting the bytecode generated for a simple call, and walking through the CPython CALL instruction, stack layout, method handling, and the relationship between PyFunctionObject, PyFrameObject, and PyCodeObject.