Guido van Rossum & Fred L. Drake Jr. (2009)
Python Software Foundation.
URL: https://docs.python.org/3/reference/
Abstract. The official language reference for Python, maintained by the Python Software Foundation. It defines the syntax and core semantics of the language, including the data model, execution model, import system, expressions, and statements. This is the authoritative specification that all implementations of Python must conform to.
Tags: python reference official