# Python 3.9.17 documentation

Welcome! This is the official documentation for Python 3.9.17.

Parts of the documentation:

What's new in Python 3.9? or all "What's new" documents since 2.0 Tutorial start here Library Reference keep this under your pillow Language Reference describes syntax and language elements Python Setup and Usage how to use Python on different platforms Python HOWTOs in-depth documents on specific topics | Installing Python Modules installing from the Python Package Index & other sources Distributing Python Modules publishing modules for installation by others Extending and Embedding tutorial for C/C++ programmers Python/C API reference for C/C++ programmers FAQs frequently asked questions (with answers!)

Indices and tables:

Global Module Index quick access to all modules General Index all functions, classes, terms Glossary the most important terms explained | Search page search this documentation Complete Table of Contents lists all sections and subsections

Meta information:

Reporting bugs Contributing to Docs About the documentation | History and License of Python Copyright