Satori Komeiji's Programming Classroom

Aug 26, 2024 · Fundamentals

How Python dict’s custom methods like get, setdefault, and popitem are implemented

This article dissects the CPython implementation of three dictionary methods—get, setdefault, and popitem—showing example usage, walking through the C source code, explaining hash look‑ups, entry handling, and the subtle state changes that occur when keys are missing or removed.