Satori Komeiji's Programming Classroom

Nov 15, 2024 · Fundamentals

How Python Functions Are Created: From def to PyFunctionObject

The article explains step‑by‑step how a Python function is turned into a PyFunctionObject at runtime, covering the role of PyCodeObject, the MAKE_FUNCTION bytecode instruction, attribute handling such as defaults and annotations, name resolution, variable binding, and techniques for inspecting and copying functions.