---
id: zope-interface
version: "8.5"
license: ZPL-2.1
license_treatment: unclear
maintenance: active
---

# zope.interface — Interfaces for Python

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

## Install

pip install zope-interface
uv add zope-interface
poetry add zope-interface

## Description

====================
 ``zope.interface``
====================

.. image:: https://img.shields.io/pypi/v/zope.interface.svg
    :target: https://pypi.python.org/pypi/zope.interface/
    :alt: Latest Version

.. image:: https://img.shields.io/pypi/pyversions/zope.interface.svg
        :target: https://pypi.org/project/zope.interface/
        :alt: Supported Python versions

.. image:: https://github.com/zopefoundation/zope.interface/actions/workflows/tests.yml/badge.svg
        :target: https://github.com/zopefoundation/zope.interface/actions/workflows/tests.yml

.. image:: https://readthedocs.org/projects/zopeinterface/badge/?version=latest
        :target: https://zopeinterface.readthedocs.io/en/latest/
        :alt: Documentation Status

This package is intended to be independently reusable in any Python
project. It is maintained by the `Zope Toolkit project
<https://zopetoolkit.readthedocs.io/>`_.

This package provides an implementation of "object interfaces" for Python.
Interfaces are a mechanism for labeling objects as conforming to a given
API or contract. So, this package can be considered as implementation of
the `Design By Contract`_ methodology support in Python.

.....

## AI interpretation — verify before relying

Provides a Python implementation of object interfaces for declaring and enforcing API contracts using Design by Contract methodology, enabling runtime type checking and interface-based polymorphism.

Verdict: A stable, actively maintained foundational library (18+ years, top 1000 PyPI) with zero known vulnerabilities and broad Python version support (3.10–3.14, including free-threaded variants). Medium install friction from C extensions is offset by no runtime dependencies and solid maintenance. License clarity should be verified before use in proprietary projects.

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