CPythons internals

The CPython code base is constantly changing and evolving. Heres a sample of references about CPythons architecture aimed at building your understanding of CPython internals and its evolution:

**Current references**
Title	Brief	Author	Version
CPythons InternalDocs	Docs on CPython internals maintained in the source tree
A guide from parser to objects, observed using GDB	Code walk from Parser, AST, Sym Table and Objects	Louie Lu	3.7.a0
Green Tree Snakes	The missing Python AST docs	Thomas Kluyver	3.6
Yet another guided tour of CPython	A guide for how CPython REPL works	Guido van Rossum	3.5
Python Asynchronous I/O Walkthrough	How CPython async I/O, generator and coroutine works	Philip Guo	3.5
Coding Patterns for Python Extensions	Reliable patterns of coding Python Extensions in C	Paul Ross	3.9+
Your Guide to the CPython Source Code	Your Guide to the CPython Source Code	Anthony Shaw	3.8

**Historical references**
Title	Brief	Author	Version
Pythons Innards Series	ceval, objects, pystate and miscellaneous topics	Yaniv Aknin	3.1
Eli Benderskys Python Internals	Objects, Symbol tables and miscellaneous topics	Eli Bendersky	3.x
A guide from parser to objects, observed using Eclipse	Code walk from Parser, AST, Sym Table and Objects	Prashanth Raghu	2.7.12
CPython internals: A ten-hour codewalk through the Python interpreter source code	Code walk from source code to generators	Philip Guo	2.7.8

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Last updated on Dec 19, 2025