asyncio compatible library for working with HTTP protocol.
Reference implementation of PEP 3156 — Asynchronous IO Support Rebooted.

A search server based on Lucene. It provides a distributed, multitenant-capable full-text search engine with a RESTful web interface and schema-free JSON documents.

Official python client for ElasticSearch
ipdb exports functions to access the IPython debugger, which features tab completion, syntax highlighting, better tracebacks, better introspection with the same interface as the pdb module.

Python style guide checker

pep8 is a tool to check your Python code against some of the style conventions in PEP 8 – Style Guide for Python Code.


passive checker of Python programs

A simple program which checks Python source files for errors.

Pyflakes analyzes programs and detects various errors. It works by parsing the source file, not importing it, so it is safe to use on modules with side effects. It’s also much faster.


standard python module for creating lightweight “virtual environments” with their own site directories, optionally isolated from system site directories. Each virtual environment has its own Python binary (allowing creation of environments with various Python versions) and can have its own independent set of installed Python packages in its site directories.


The tool to create isolated Python environments. It’s not included into python stdlib’s but it is very popular instrument.

venv and virtualenv does almost the same, venv has been developed after the virtualenv.


virtualenvwrapper is a set of extensions to Ian Bicking’s virtualenv tool. The extensions include wrappers for creating and deleting virtual environments and otherwise managing your development workflow, making it easier to work on more than one project at a time without introducing conflicts in their dependencies.

virtualenvwrapper is my choice, highly recommend the tool to everyone.