wybthon

Wybthon

Build interactive web apps in Python, no JavaScript required.

Documentation · Getting Started · Examples · Contributing

Overview

Wybthon is a client-side SPA framework that lets you build interactive web applications entirely in Python. Powered by Pyodide, it runs in the browser and provides a signals-first reactive model inspired by SolidJS. With fine-grained reactivity, a virtual DOM, component model, routing, forms, and context, you can write modern frontends without touching JavaScript.

Features

Run-once components + reactive holes: function bodies run a single time at mount. Embed a signal getter anywhere in your VNode tree and the reconciler wires it as a reactive hole: only that DOM node updates when the signal changes. No React-style re-renders.
Signals-first reactivity: Fine-grained updates with create_signal, create_effect, create_memo, and untrack, with automatic batching: writes apply immediately and effects run once per flush.
Async-first: Pass an async def to create_memo for async data; Loading boundaries show fallbacks, later refetches serve the stale value while revalidating, and action plus optimistic state cover mutations.
Virtual DOM: Function components with efficient, batched diffing, amortising the Pyodide ↔ JS bridge cost while keeping SolidJS-style fine-grained updates above it.
Client-side router: Path parameters, query parsing, Link component, and programmatic navigation.
Context API: Share state across the component tree with create_context and use_context.
Forms and validation: Built-in form state management with validators and two-way bindings.
Flow control primitives: Show, For, Repeat, Switch, Match, and Dynamic for declarative rendering.
Error and loading boundaries: ErrorBoundary for graceful error handling and Loading for declarative async fallbacks.
Dev server with hot reload: wyb dev launches a local server with SSE-based auto-reload.

Quick Start

Installation

pip install wybthon

Usage

from wybthon import button, component, create_signal, div, p, span


@component
def Counter(initial: int = 0):
    count, set_count = create_signal(initial)
    # The body runs ONCE.  ``count`` is a reactive hole, so only the
    # text node inside the span updates when the signal changes.
    return div(
        p("Count: ", span(count)),
        button("Increment", on_click=lambda e: set_count(count() + 1)),
    )

Documentation

Visit wybthon.com for the full documentation, including getting started guides, core concepts, API reference, and working examples.

Contributing

Contributions are welcome. Please see CONTRIBUTING.md for setup instructions, coding standards, and guidelines for submitting pull requests.

License

MIT

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