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pygments/pygments

GitHub

Pygments is a generic syntax highlighter written in Python, designed to prettify source code for code hosting, forums, wikis, and similar applications. It supports over 500 languages and text formats, making it useful when you need consistent syntax highlighting.

Last release: 2026-03-29

eliben/pycparser

GitHub

pycparser is a complete C99 parser written in pure Python, designed to parse C source code for applications that need to analyze or transform it. It is useful for tasks like static code checking, building a front end for specialized C compilers, and generating information such as unit-test discovery, and it can integrate with CFFI to parse C function and type declarations.

Last release: 2026-01-21

pyasn1/pyasn1

GitHub

pyasn1 is a generic ASN.1 library for Python that provides implementations of ASN.1 types plus standard BER, CER, and DER codecs. It is useful for building Python objects from ASN.1 definitions, encoding and decoding ASN.1 data structures, and loading or dumping ASN.1 structures from Python types, originally for SNMP and then generalized for other protocols.

Last release: 2026-03-17

aio-libs/propcache

GitHub

propcache is a Python 3 library that provides a fast implementation of cached properties for Python 3.10+. It is designed to be nearly identical to functools.cached_property, with an additional under_cached_property option that caches using self._cache. Useful for speeding up computed properties in Python applications, including optional pure Python or compiled installs.

Last release: 2026-05-08

python-pillow/Pillow

GitHub

Pillow is the friendly Python Imaging Library (PIL) fork, providing image processing capabilities for Python. It supports many image file formats and includes an internal representation designed for fast access to common pixel formats, making it useful for building applications that load, manipulate, and process images.

Last release: 2026-04-01

pypa/packaging

GitHub

packaging (pypa/packaging) is a Python library of reusable core utilities for Python package interoperability. It provides shared implementations for common packaging standards, including version handling, specifiers, markers, requirements, tags, metadata, lockfiles, and direct URL helpers. Useful for developers who need consistent behavior when parsing and working with Python package metadata and versioning.

Last release: 2026-04-24

aio-libs/multidict

GitHub

Multidict is a Python 3 library that provides dict-like containers for key-value pairs where a key can occur multiple times, preserving insertion order. It is useful for representing HTTP headers and URL query string data, with both regular and proxy multidict classes, plus case-insensitive variants. It also supports optional C extensions for speed.

Last release: 2026-01-26

pallets/markupsafe

GitHub

MarkupSafe provides a Python text wrapper that escapes special characters so untrusted strings can be safely included in HTML and XML. It helps mitigate injection attacks by converting characters with special meanings into their escaped forms, and it integrates with template engines like Jinja.

Last release: 2025-09-27

sqlalchemy/mako

GitHub

Mako is a Python template library that uses a familiar, non-XML syntax, compiling templates into Python modules for performance. It is useful for building flexible, componentized layouts with inheritance, while keeping templates closely aligned with Python calling and scoping semantics.

Last release: 2026-04-28

alisaifee/limits

GitHub

limits is a Python library for implementing rate limiting with multiple strategies (fixed window, moving window, and sliding window counter). It works in both sync and async code, and stores counters using backends like Redis, Memcached, MongoDB, or in-memory.

Last release: 2026-02-05

jmespath/jmespath.py

GitHub

JMESPath is a query language for JSON, and the jmespath.py library lets Python code declaratively extract values from JSON-like data using JMESPath expressions. It’s useful for single or repeated lookups, with `search` for one-off queries and `compile` for reusing the same parsed expression, and it supports options and (experimental) custom functions.

Last release: 2026-01-22

pydantic/jiter

GitHub

jiter is a fast iterable JSON parser written in Rust. It provides interfaces to represent JSON data as `JsonValue`, iterate through JSON with `Jiter`, or parse a JSON string into a Python object via `PythonParse`, useful when you want low-overhead, schema-aware JSON processing.

Last release: 2026-05-19

pallets/itsdangerous

GitHub

ItsDangerous provides helpers to safely pass trusted data to untrusted environments and get it back intact. It signs tokens cryptographically to prevent tampering, with options for custom serialization, optional compression, and automatic timestamping and verification when loading a token.

Last release: 2024-04-16

pytest-dev/iniconfig

GitHub

iniconfig is a small, simple INI file parser module for Python. It preserves the order of sections and entries, supports multi-line values and “#” comments, and reports errors with proper line numbers, with an Error raised if two sections share the same name.

Last release: 2025-10-18

kjd/idna

GitHub

Internationalized Domain Names for Python (IDNA 2008 and UTS #46) provides `encode` and `decode` helpers to convert domain names between Unicode (U-labels) and ASCII-compatible encoding (A-labels). It also includes Unicode IDNA Compatibility Processing (UTS #46), optional per-label conversion helpers, and raises specific errors for invalid code points and bidi/context issues.

Last release: 2026-06-02

encode/httpx

GitHub

HTTPX is a fully featured HTTP client library for Python 3, useful for making HTTP requests with both synchronous and async APIs. It supports HTTP/1.1 and HTTP/2, includes an integrated command line client, and can be used to send requests to WSGI and ASGI applications.

Last release: 2024-12-06

MagicStack/httptools

GitHub

httptools is a Python package that provides fast HTTP parsing bindings, exposing HttpRequestParser and HttpResponseParser classes for parsing HTTP requests and responses, plus a parse_url helper. It is useful when you need efficient, callback-driven parsing of HTTP traffic and structured URL parsing in Python.

Last release: 2026-05-25

encode/httpcore

GitHub

HTTP Core is a minimal low-level HTTP client for Python, focused on sending HTTP requests. It avoids higher-level features like redirects, authentication header building, caching, URL parsing, and content decoding, and instead provides thread-safe or task-safe connection pooling, HTTP(S) and SOCKS proxy support, and both sync and async interfaces (including HTTP/1.1 and HTTP/2).

Last release: 2025-04-24