In this article, the author explores the implementation details behind types, operators, and dynamic dispatch in CPython. They explain how the Python runtime executes operations such as “a + b” by following a bottom-up approach. They delve into the implementation of various data types, such as floats, and show how they use function pointer tables to handle operators. The author also discusses the abstract object interface in CPython, which unifies access to different type implementations. Finally, they explain how the CPython virtual machine delegates operator execution to the abstract object interface through function pointer lookup.
https://codeconfessions.substack.com/p/cpython-dynamic-dispatch-internals