Flet Node System

What is Flet Node System?

Flet Node System is a visual node editor + async Python runtime for building dataflow-based applications. It lets you:

1. Design node graphs visually using a Flutter-based editor in Flet
2. Execute them asynchronously with a pure Python runtime
3. Extend with custom nodes by writing simple Python classes

Key Features

• Separation of Concerns: UI layer is completely independent from execution layer
• Concurrent Execution: Dependencies are evaluated in parallel; results are cached
• Type Safety: Optional type hints for inputs/outputs
• Cycle Detection: Automatic validation of node graphs
• Easy Extensibility: Add new node types without touching UI code

Documentation Structure

• Interface — how to define nodes and specs
• Architecture — deep dive into layers and execution flow
• Development — extending with custom node logic
• Examples — runnable demos and patterns
• Building — setup and running
• Engine — advanced execution details

Start Here

New to Flet Node System? Check out Examples for a quick demo.