typeguard

Run-time type checker for Python

typeguard Permissive license MIT Active ★ 1,779 v4.6.0 released 2026-07-26

Install

typeguard on PyPI

pip

pip install typeguard

uv

uv add typeguard

poetry

poetry add typeguard

Package facts

License	MIT (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	1 — typing_extensions
Maintenance	actively maintained — 18 days since the last release
Last repo commit	2026-07-26
First released	2015-12-29
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: typeguard-4.6.0-py3-none-any.whl

Development Status :: 5 - Production/StableIntended Audience :: DevelopersProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.15

About typeguard

from the package's own PyPI description — quoted content, verbatim

.. image:: https://github.com/agronholm/typeguard/actions/workflows/test.yml/badge.svg :target: https://github.com/agronholm/typeguard/actions/workflows/test.yml :alt: Build Status .. image:: https://coveralls.io/repos/agronholm/typeguard/badge.svg?branch=master&service=github :target: https://coveralls.io/github/agronholm/typeguard?branch=master :alt: Code Coverage .. image:: https://readthedocs.org/projects/typeguard/badge/?version=latest :target: https://typeguard.readthedocs.io/en/latest/?badge=latest :alt: Documentation .. image:: https://tidelift.com/badges/package/pypi/typeguard :target: https://tidelift.com/subscription/pkg/pypi-typeguard :alt: Tidelift

This library provides run-time type checking for functions defined with PEP 484 <https://www.python.org/dev/peps/pep-0484/>_ argument (and return) type annotations, and any arbitrary objects. It can be used together with static type checkers as an additional layer of type safety, to catch type violations that could only be detected at run time.

Three principal ways to do type checking are provided, each with its pros and cons: