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A Python Framework for writing Reactive web Front-Ends

Project description

Starfyre Logo

Starfyre ⭐🔥


Starfyre is a library that allows you to build reactive frontends using only Python. It is built using pyodide and wasm, which enables it to run natively in the browser. With Starfyre, you can create interactive, real-time applications with minimal effort. Simply define your frontend as a collection of observables and reactive functions, and let Starfyre handle the rest.

Please note that Starfyre is still very naive and may be buggy, as it was developed in just five days. However, it is under active development and we welcome contributions to improve it. Whether you are a seasoned web developer or new to frontend development, we hope that you will find Starfyre to be a useful tool. Its intuitive API and simple, declarative style make it easy to get started, and its powerful features allow you to build sophisticated applications.


pip install starfyre

A sample project is hosted on GitHub.

Sample Usage


from .parent import parent
from .store import store

def mocked_request():
  return "fetched on the server"

async def handle_on_click(e):
  alert("click rendered on client")
  if 1==1:
    print("Hello world")

  current_value = get_parent_signal()
  set_parent_signal(current_value + 1)
  a = await fetch('')
  print(await a.text())
  print("handles on click")

  body {
    background-color: red;

    <parent hello='world'>
        <span onclick={handle_on_click}>
          {[ mocked_request() for i in range(4)]}

// this is the optional section 
// for third party scripts and custom js


import requests

def ssr_request():
  text = "Hello"
  if text != "":
    return text + " from Server Side"
    return "No response"

        This won't be re-rendered


use_parent_signal, set_parent_signal, get_parent_signal = create_signal(2)

use_clock_signal, set_clock_signal, _ = create_signal(0)

Developing Locally

  1. Run the script ./
  2. You can find a small test application in the test-application directory.

Running the sample app with Docker

  1. Build the image docker build --tag starfyre .
  2. Run the container docker run -v ./test-application:/app/test-application/ starfyre
  3. Check the test-application directory for build and dist directories that contain the outputs
  4. If you would like to develop interactively inside the container, run docker run -it -v ./test-application:/app/test-application/ starfyre bash


Feel free to open an issue and let me know what you think of it.

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