Small text templating language

https://pythonpaste.org/tempita/

ACME protocol implementation in Python

https://certbot.eff.org/ https://github.com/certbot/certbot https://github.com/certbot/certbot/tree/master/acme

Adobe Font Development Kit for OpenType

https://github.com/adobe-type-tools/afdko

Async client for aws services using botocore and aiohttp

https://aiobotocore.readthedocs.io/en/latest/ https://github.com/aio-libs/aiobotocore

Simple DNS resolver for asyncio

https://pypi.org/project/aiodns/

FTP client/server for asyncio

https://pypi.org/project/aioftp/ https://aioftp.readthedocs.io/ https://github.com/aio-libs/aioftp

Async http client/server framework (asyncio)

https://docs.aiohttp.org/en/stable/ https://github.com/aio-libs/aiohttp

Itertools and builtins for AsyncIO and mixed iterables

https://github.com/omnilib/aioitertools

Python library for accessing PostgreSQL database using asyncio

https://github.com/aio-libs/aiopg

Implementation of QUIC and HTTP/3

https://github.com/aiortc/aioquic

Python asyncio (PEP 3156) Redis client library

https://github.com/aio-libs/aioredis

List of registered asynchronous callbacks

https://github.com/aio-libs/aiosignal

Asyncio based SMTP server

https://aiosmtpd.readthedocs.io/

AsyncIO bridge to the standard sqlite3 module for Python 3.5+

https://pypi.python.org/pypi/aiosqlite

Modified Kr Sphinx theme

https://github.com/bitprophet/alabaster

Database migration tool for SQLAlchemy

https://alembic.zzzcomputing.com/

Database migration tool for SQLAlchemy (1.4.X branch)

https://alembic.zzzcomputing.com/

Collapse Python packages into a single module

https://github.com/xonsh/amalgamate

Library for parsing ISO 8601 strings

https://bitbucket.org/nielsenb/aniso8601/

Convert text with ansi color codes to HTML

https://ansi2html.readthedocs.io/ https://github.com/pycontribs/ansi2html

Radically simple IT automation

https://www.ansible.com/

Extensible embeddable ansible job runner

https://ansible-runner.readthedocs.io/

ANother Tool for Language Recognition (python3 runtime)

https://www.antlr.org/

Unicode to ASCII transliteration

https://github.com/anyascii/anyascii

High level compatibility layer for multiple asynchronous event loop implementations

https://github.com/agronholm/anyio

Namespace control and lazy-import mechanism

https://bitbucket.org/hpk42/apipkg

Pluggable API specification generator

https://github.com/marshmallow-code/apispec

Web framework plugins for apispec

https://github.com/marshmallow-code/apispec-webframeworks

Python module for determining platform-specific dirs

https://github.com/ActiveState/appdirs

Another Python SQLite Wrapper

https://rogerbinns.github.io/apsw/ https://github.com/rogerbinns/apsw

Bash tab completion for argparse

https://kislyuk.github.io/argcomplete/ https://github.com/kislyuk/argcomplete

Secure Argon2 password hashing algorithm

https://argon2-cffi.readthedocs.io/en/stable/ https://github.com/hynek/argon2-cffi

Low-level CFFI bindings for Argon2

https://github.com/hynek/argon2-cffi-bindings

Better dates and times for Python

https://github.com/arrow-py/arrow

ASGI specs, helper code, and adapters

https://github.com/django/asgiref/

ASN.1 library with a focus on performance and a pythonic API

https://github.com/wbond/asn1crypto

Astor allows easy manipulation of Python source via the AST

https://github.com/berkerpeksag/astor

Abstract syntax tree for Python with inference support

https://pylint.readthedocs.io/projects/astroid/en/latest/ https://github.com/pylint-dev/astroid

Abstract syntax tree for Python with inference support

https://pylint.readthedocs.io/projects/astroid/en/latest/ https://github.com/pylint-dev/astroid

Annotate AST trees with source code positions

https://pypi.org/project/asttokens/ https://github.com/gristlabs/asttokens

Tiny library to add async generators to Python 3.5

https://pypi.org/project/async_generator/

Timeout context manager for asyncio programs

https://github.com/aio-libs/async-timeout

Enhance unittest for testing asyncio libraries

https://github.com/Martiusweb/asynctest

AtomicLong type using CFFI

https://pypi.org/project/atomiclong/

Atomic file writes library

https://github.com/untitaker/python-atomicwrites

Very simple decorator and function of module's all

https://public.readthedocs.io/

Python API for the D-BUS based SPI framework

https://gitlab.gnome.org/GNOME/pyatspi2

Python attributes without boilerplate

https://github.com/python-attrs/attrs

Generate email authentication headers

https://github.com/ValiMail/authentication-headers

Python module for RFC 5451 Authentication-Results headers

https://launchpad.net/authentication-results-python/