---
id: comtypes
version: "1.4.16"
license: MIT
license_treatment: permissive
maintenance: active
---

# comtypes — Pure Python COM package

License: permissive · Maintenance: active · Downloads: 5.8M/mo

## What it is and what it does

comtypes is a pure Python wrapper around the Windows Component Object Model (COM), built on top of ctypes. It lets you call COM interfaces from Python code, define custom COM interfaces, and work with dispatch-based COM objects without requiring compiled extensions or external dependencies. The library generates Python modules from COM type libraries, allowing you to interact with Windows applications and system components that expose COM interfaces.

The package is designed for developers who need to automate Windows applications, access system COM services, or integrate Python with legacy Windows software. It has no required runtime dependencies beyond Python itself, though numpy can optionally be installed to handle COM arrays as numpy ndarrays. The library is actively maintained and widely used in the top 5000 PyPI packages by download volume.

Use it for:

- Automate Microsoft Office applications (Word, Excel, Outlook) from Python scripts.
- Access Windows system COM services and APIs for system administration or monitoring tasks.
- Build Python wrappers around proprietary Windows applications that expose COM interfaces.
- Integrate Python with legacy Windows software that communicates via COM.
- Generate type-safe Python bindings from COM type libraries for interoperability.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

comtypes is a pure Python library for defining, calling, and implementing COM (Component Object Model) interfaces on Windows using the ctypes foreign function interface.

Yes, if you are on Windows and need to interact with COM interfaces or automate Windows applications. The package is production-stable, actively maintained, has no external dependencies, and carries no known vulnerabilities. The main constraint is that it is Windows-only and requires Python 3.9+; if you are cross-platform or on an older Python version, it will not work for you.

## Install

pip install comtypes
uv add comtypes
poetry add comtypes

## Installing comtypes

Before you install: Installation is straightforward with no runtime dependencies. The package is actively maintained with recent commits and has been in production use since 2014. However, it is Windows-only and requires Python 3.9 or later; users on Python 3.8 or earlier will need an older version.

License in practice: Licensed under MIT (permissive), so you can use, modify, and distribute comtypes freely in commercial and open-source projects with minimal restrictions.

Quickstart:

pip install comtypes

import comtypes
from comtypes.client import GetObject

# Example: interact with a COM object
obj = GetObject(None, 'ProgID.ClassName')

Windows operating system required; COM is a Windows-specific technology. Python 3.9 or later is required.

Verify before relying:

- Whether the Python 3.15 IntFlag behavior change (GH-894) will require code updates for existing projects using comtypes.
- Performance characteristics when working with large COM arrays or complex type hierarchies.
- Compatibility status with the latest Windows versions and COM implementations.

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 5.8M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

COM interface python windows, component object model ctypes, windows COM automation python, dispatch-based COM interfaces, python COM client library, windows interop pure python, COM type library wrapper, windows-interop, com-automation

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