# IronPython

Implementation of Python 3.x for .NET Framework that is built on top of the Dynamic Language Runtime.

Repository: https://github.com/IronLanguages/ironpython3
Canonical: https://ross.abutalabs.com/products/ironpython
Language: C#
License: Apache-2.0
License Family: permissive
Topics: ironpython, dlr, c-sharp, python
Last push: 2026-08-17T12:33:36+00:00
Link (homepage): http://ironpython.net
Link (site_page): https://ironpython.net/documentation

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 8, longevity 100
- inputs: {"age_days": 4570, "days_push": 16, "days_rel": 622, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2759, forks 314 (observed 2026-08-28T04:07:18.387747+00:00)

## What it is
IronPython is an open-source implementation of the Python programming language built on the .NET Dynamic Language Runtime, targeting Python 3 (currently Python 3.4 compatibility) with a Python 2.7 line also maintained. It lets Python code use .NET libraries and lets .NET applications embed Python as a scripting engine via NuGet.

## Use cases
- embed a python scripting engine in a c# application
- call .net framework apis from python code
- expose python code to other .net languages
- script a .net application with python
- run python on the clr with .net standard support

## When to choose
- you need tight interop between Python and .NET libraries
- you want to embed a dynamic scripting language in a .NET app
- you need Python on Windows/.NET Framework or .NET Core

## When to avoid
- you need full modern Python 3.x compatibility (target is Python 3.4)
- you rely on CPython C extensions or the latest Python packages
- you need maximum Python performance

## Facets
- artifact type: library
- maturity: active
- function: interpreter, programming-language, sdk
- domain: programming-languages, cross-platform, developer-tools
- platform: dotnet, cross-platform, windows
- tags: ironpython, dynamic-language-runtime, dlr, python-implementation, clr, embedding, scripting, linux, macos

## Member repositories
- IronLanguages/ironpython3 (main) score 67
- IronLanguages/main (mirror) score 10
- IronLanguages/ironpython2 (main) score 55

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:18.387747+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:18:46.567398+00:00, confidence not recorded.
  - readme: https://github.com/IronLanguages/ironpython3 (fetched 2026-08-28T04:07:18.387747+00:00, sha 404024c800ea)
  - homepage: http://ironpython.net (fetched 2026-08-29T09:56:43.063375+00:00, sha 2121d484df99)
  - site_page: https://ironpython.net/documentation (fetched 2026-08-29T09:56:43.072562+00:00, sha 5e569088e56e)
- Data as of 2026-08-30T08:39:29.467469+00:00.