---
id: zope-lifecycleevent
version: "6.0"
license: ZPL-2.1
license_treatment: unclear
maintenance: aging
---

# zope.lifecycleevent — Object life-cycle events

License: unclear · Maintenance: aging · Downloads: 165.7K/mo

## What it is and what it does

zope.lifecycleevent provides a small set of event classes and convenience functions for notifying subscribers about object lifecycle changes—creation, modification, and removal—in systems built on the zope.event dispatch framework. It sits between zope.event (which provides generic event notification) and application code, offering a standard vocabulary for lifecycle events so that loosely-coupled components can react to object state changes without direct dependencies on one another.

The package is part of the Zope ecosystem and is typically used in component-based architectures where multiple subsystems need to be aware of object changes without tight coupling. It depends on zope.interface and zope.event, and is designed to have minimal external dependencies so that packages can rely on it without pulling in heavy frameworks. The library is stable (Production/Stable status), supports modern Python versions (3.9–3.13), and has been maintained since 2007.

Use it for:

- Notify subscribers when an object is created, modified, or deleted in a component-based application.
- Implement audit logging or change tracking by subscribing to lifecycle events.
- Trigger side effects (e.g., cache invalidation, index updates) when objects change without hardcoding those side effects into business logic.
- Build plugin systems where third-party code reacts to lifecycle events without knowing about other subscribers.
- Integrate with zope.container or similar frameworks that rely on standard lifecycle event objects.

## Worth the install?

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

Defines event objects and API functions for tracking object lifecycle events—creation, modification, and removal—in loosely-coupled systems using the zope.event dispatch mechanism.

Yes, if you are building a Zope-based or component-oriented system that uses zope.event for event dispatch. The package is stable, has no known vulnerabilities, and provides a standard event vocabulary that reduces coupling. No, if you are not already using zope.event or zope.interface—the package is tightly scoped to that ecosystem and offers little value outside it. Maintenance is aging but not abandoned; releases are infrequent but track current Python versions.

## Install

pip install zope-lifecycleevent
uv add zope-lifecycleevent
poetry add zope-lifecycleevent

## Installing zope.lifecycleevent

Before you install: Low install friction with a pure-wheel distribution. Maintenance status is aging—last release was 336 days ago—but the package is stable and actively supported for current Python versions (3.9–3.13).

License in practice: Licensed under ZPL-2.1 (Zope Public License 2.1), which is OSI-approved but less common than MIT or Apache 2.0. Verify compatibility with your project's licensing requirements before adopting.

Quickstart:

pip install zope.lifecycleevent

from zope.lifecycleevent import ObjectModifiedEvent
from zope.event import notify

notify(ObjectModifiedEvent(my_object))

Requires Python 3.9 or later. Intended for use within a zope.event-based system; standalone use outside that context is not typical.

Verify before relying:

- Whether the 'aging' maintenance status reflects intentional stability or reduced active development.
- Specific use cases where this package is preferred over direct zope.event or zope.component integration.

## Package facts

- License: ZPL-2.1 (unclear)
- Python support: supports_current
- Install friction: low
- Maintenance: aging
- Downloads: 165.7K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

object lifecycle events, zope event system, object creation modification removal, event notification framework, loosely coupled event dispatch, zope component events, object state change events, zope-ecosystem, event-dispatch, component-architecture

[View on SkillFed](https://skillfed.io/packages/zope-lifecycleevent) · [View on PyPI](https://pypi.org/project/zope-lifecycleevent/)