Welcome to lazysignals’s Documentation!

Last update: May 11, 2025

A Python library that allows you to run effects whenever state changes. It employs dependency discovery and updates are lazy. The library is conceptually inspired by signals in JavaScript.

This project is released on GitHub under the MIT License.

What this library is.

• A simple reactive programming library.

What this library isn’t.

• An event framework.

• A lazy evaluation framework.

Contents

• FAQs
  • How can I ask questions?
  • Who is this library for?
  • Isn’t this just the Observer Pattern?
• Installation
  • Python Package
  • From Source
• Example Usage
• Lazy Signals
  • Define Signals
  • Define Effects
  • A Note on Dependency Detection
  • A Note on Exceptions
• Internal Mechanics
  • Dependency Detection
  • Lazy Evaluation
• Changelog
  • [Unreleased]
  • [0.2.0] - 2025-05-11
  • [0.1.0] - 2025-05-06
• Contributing
• MIT License
• API Reference
  • lazysignals
• Index