---
id: typeguard
version: "4.6.0"
license: MIT
license_treatment: permissive
maintenance: active
---

# typeguard — Run-time type checker for Python

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install typeguard
uv add typeguard
poetry add typeguard

## Description

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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:

#. The ``check_type`` function:

   * like ``isinstance()``, but supports...

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