ReactPy

ReactPy is a implementation of React in Python using Brython. ReactPy application runs on the client side, which are written in Python 3. It's Component based and follows the same virtual DOM and Fiber architecture as ReactJS. ReactPy also supports PYX syntax which is equivalent to JSX in Javascript.

Getting Started

Creating a ReactPy app is very simple and the process in very much inspired from ReactJS.

Installation

ReactPy has a PyPI package

pip install ReactPy

Setting Up

Once ReactPy is installed, then to setup boiler plate -

1. Create an empty folder for your application.
2. Then run the following command to Initialize ReactPy

python3 -m ReactPy --init

Setup live reload server

ReactPy comes with a simple live reload development server, to use start it -

python3 -m ReactPy --serve

This will start a development server at http://127.0.0.1:5500/

Create a deployment build

To create a deployment build of your application -

python3 -m ReactPy --build

This will create a build directory in project folder. Then this can be very easily deployed to services like Netlify Drop by uploading build folder for deployment.

Syntax Highlighting

To get syntax highlighting on.pyx files in ReactPy applications, install ReactPy Syntax Highlighter in VSCODE from Visual Studio Marketplace.

Examples

Todo List using ReactPy - https://react-py-todo.netlify.app/

Passing Props

import ReactPy
from browser import document

def Greetings(props):
    return <h1>Hi, {" " + props["name"]}</h1>

element = <Greetings name="World!"/>
ReactPy.render(element, document.getElementById("root"))

Counter

import ReactPy
from browser import document

def Counter(props):
    count, setCount = ReactPy.useState(0)
    return  <div>
                <h1>Count :{count}</h1>
                <button onClick={lambda e: setCount(count + 1)}>+</button>
                <button onClick={lambda e: setCount(count - 1)}>-</button>
            </div>

element = <Counter/>
ReactPy.render(element, document.getElementById("root"))

Timer

import ReactPy
from browser import document
from browser.timer import set_interval, clear_interval

def Timer(props):
    seconds, setSeconds = ReactPy.useState(props["timelimit"])
    running, setRunning = ReactPy.useState(False)

    if seconds < 1:
        setRunning(False)

    def _tick():
        setSeconds(lambda s: s - 1)

    def __effect():
        if running:
            print("Set Interval")
            __interval = set_interval(_tick, 1000)
            return lambda: clear_interval(__interval)

    ReactPy.useEffect(__effect, [running])

    color = "red" if not running else "blue"

    return
        <div>
            <div style={{"color": color}}>Seconds : {seconds}</div>
            <button onClick={lambda e: setRunning(lambda r: not r)}>Start / Stop</button>
        </div>

element = <Timer timelimit={5}/>
ReactPy.render(element, document.getElementById("root"))

Live Input

import ReactPy
from browser import document

def LiveInput(props):
    value, setValue = ReactPy.useState("")

    return
        <div>
            <input value={value + ""} onInput={lambda e: setValue(e.target.value)}/>
            <h1>{value}</h1>
        </div>

element = <LiveInput/>
ReactPy.render(element, document.getElementById("root"))

API Call

import ReactPy
from ReactPy.utils import lmap
from browser import document
from browser.ajax import get

def UserCard(props):
    return <div style={{
            "border": "1px solid black",
            "padding": "5px",
            "margin": "10px",
        }}>
            <h2>{props["name"]}</h2>
            <p>email: {" " + props["email"]}</p>
            <p>website: {" " + props["website"]}</p>
        </div>

def UserList(props):
    users, setUsers = ReactPy.useState([])

    def __effect():
        def _on_complete(res):
            print(res.json)
            setUsers(res.json)

        get("https://jsonplaceholder.typicode.com/users", oncomplete = _on_complete)

    ReactPy.useEffect(__effect, [])

    return  <div>
                {lmap(
                    lambda x: <UserCard name={x["name"]} email={x["email"]} website={x["website"]}/>,
                    users
                ) if len(users) > 0 else <h1>Loading...</h1>}
            </div>

element = <UserList/>
print(element)
ReactPy.render(element, document.getElementById("root"))

Contributions

Check Contribution.md for Detailed Information.

Note

This project is still in beta, so if you find any bugs please raise an issue.