Events
Bringing the elegance of C# EventHandler to Python
Decision gist · record as of 2026-08-14
Yes, if you need a minimal event-dispatch mechanism and do not require ongoing maintenance. The package is stable, has no dependencies, and is permissively licensed. However, do not use it for security-critical or actively developed projects—it is abandoned and will not receive updates. For new projects, consider whether a more actively maintained alternative better suits your long-term needs.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Installation is frictionless with no runtime dependencies.
- However, the package is abandoned—last release was 2023-07-31 with no commits since 2023-08-07.
- It remains stable for its narrow use case but will not receive maintenance or security updates.
License · maintenance · safety
BSD (permissive) — BSD license is permissive; you can use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
last release 2023-07-31 (1110 days) · last repo commit 2023-08-07 · 329 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 33,319,270 downloads/mo, #767 on PyPI
Alternatives
Verify before relying
pip install events
from events import Events
events = Events()
events.on_change += lambda reason: print(f'changed: {reason}')
events.on_change('it happened')- Whether the package works reliably on Python versions beyond those listed in classifiers
- Performance characteristics when handling many subscribers or frequent event firing
- Active maintenance status and likelihood of future updates despite current abandonment
What it is and what it does
Events is a lightweight Python library that implements a C#-style event subscription and firing mechanism. It lets you define named event slots, attach multiple callback functions to them via `+=`, and trigger all attached handlers by calling the event. You can either allow dynamic event creation or predefine a fixed set of events by subclassing or passing an iterator to the constructor; attempting to use undefined events raises an exception.
The package has no external dependencies and installs cleanly. It is abandoned as of mid-2023, meaning no new features or bug fixes will arrive, but the core functionality is stable and the code is simple enough that it poses minimal maintenance risk for basic event-dispatch use cases.
Use it for
- Decouple event producers from consumers in a plugin or modular architecture where handlers register dynamically.
- Implement a simple observer pattern for state changes without pulling in a larger framework.
- Build a lightweight event bus for inter-component communication within a single application.
- Create a callback registry for lifecycle events in a custom framework or tool.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need a minimal event-dispatch mechanism and do not require ongoing maintenance.
The package is stable, has no dependencies, and is permissively licensed. However, do not use it for security-critical or actively developed projects—it is abandoned and will not receive updates. For new projects, consider whether a more actively maintained alternative better suits your long-term needs.
Install
events on PyPI
Before you install
Installation is frictionless with no runtime dependencies. However, the package is abandoned—last release was 2023-07-31 with no commits since 2023-08-07. It remains stable for its narrow use case but will not receive maintenance or security updates.
License in practice
BSD license is permissive; you can use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
Quickstart
pip install events
from events import Events
events = Events()
events.on_change += lambda reason: print(f'changed: {reason}')
events.on_change('it happened')Verify before relying
- Whether the package works reliably on Python versions beyond those listed in classifiers
- Performance characteristics when handling many subscribers or frequent event firing
- Active maintenance status and likelihood of future updates despite current abandonment
Package facts
| License | BSD permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 1,110 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 33,319,270 / month, #767 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 2Programming Language :: Python :: 2.7Programming Language :: Python :: 3Programming Language :: Python :: 3.4Programming Language :: Python :: 3.5Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Topic :: Software Development |
Evidence: Events-0.5-py3-none-any.whl
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