Audio

• matchering - A library for automated reference audio mastering.

Built-in Classes Enhancement

• Box - Python dictionaries with advanced dot notation access.

Code Analysis

• wemake-python-styleguide - The strictest and most opinionated python linter ever.

Database

• pickleDB - A simple and lightweight key-value store for Python.

Debugging Tools

• icecream - Inspect variables, expressions, and program execution with a single, simple function call.

Documentation

• pdoc - Epydoc replacement to auto generate API documentation for Python libraries.

Email

• modoboa - A mail hosting and management platform including a modern Web UI.

Functional Programming

• returns - A set of type-safe monads, tranformers, and composition utilities.

HTML Manipulation

• pyquery - A jQuery-like library for parsing HTML.

RESTful API

• hug - A Python 3 framework for cleanly exposing APIs.

Serialization

• python-rapidjson - A Python wrapper around RapidJSON.

Specific Formats Processing

• Python-Markdown - A Python implementation of John Gruber’s Markdown.

Testing

• nose2 - The successor to nose, based on `unittest2.

Text Processing

• pypinyin - Convert Chinese hanzi (漢字) to pinyin (拼音).
• pyparsing - A general purpose framework for generating parsers.

URL Manipulation

• furl - A small Python library that makes parsing and manipulating URLs easy.

Web Crawling

• grab - Site scraping framework.

Websites

• Ultimate Python study guide

WebSocket

• websockets - A library for building WebSocket servers and clients with a focus on correctness and simplicity.