This manual is the definitive language reference for Python. It describes the syntax of Python and its built-in datatypes. Python is an interpreted object-oriented programming language, suitable for rapid application development and scripting. This is a printed edition of the official Python Language Reference Manual from the Python 2.5 distribution (updated November 2006). For each copy sold $1 is donated to the Python Software Foundation by the publisher. This manual covers advanced topics, and is intended as a reference for readers who need a detailed description of Python's language syntax and object system. A tutorial suitable for those new to Python is available in the companion volume "An Introduction to Python" (ISBN 0954161785).