Seamless is a Python package for creating and manipulating HTML components. It works similar to React.js, but in Python.

We have detailed documentation here

Installation

pip install python-seamless

Usage

from seamless import Div, H1, P, Component, StyleObject

class MyComponent(Component):
  def render(self):
    root_style = StyleObject(color="#33343c")
    return Div(style=div_style)(
      H1(
        "Hello, World!",
      ),
      P(
        "Welcome to Seamless!"
      ),
    )

from .components import MyComponent
from seamless.renderer import render

@app.get("/")
def hello_world():
  return render(MyComponent())

Server actions

It's possible to pass a python function as component props.

The current version works with ASGIApp.

class Person(Component):
  def __init__(self, name: str, age: float):
    self.age = age
    self.name = name

  def render(self):
    return Form(on_submit=self.save_age)(
      Div(f"Update the age for {name}"),
      Label(html_for="age")(
        "Age: "
      ),
      Input(
        type="text",
        on_change=self.set_age
      ),
      Button(type="submit")(
        "Submit Age"
      ),
    )

  def set_age(self, event_data: ChangeEvent):
    self.age = event_data.value

  def save_age(self, event_data: SubmitEvent):
    user = get_user()
    user.age = self.age
    save(user)

To call a function on the server include this script in your file

<script src="https://cdn.jsdelivr.net/npm/@python-seamless/[email protected]/umd/seamless.init.js"></script>

Import the middleware and mount it to your app

from fastapi import FastAPI
from seamless.middlewares import ASGIMiddleware as SeamlessMiddleware

app = FastAPI()
app.add_middleware(SeamlessMiddleware)

You can pass the following config to the middleware to change the socket path of all seamless endpoints.

app.add_middleware(
  SeamlessMiddleware,
  socket_path="/my/custom/path"
)

Actions use socket.io to communicate between server and client.

TODO

• Add detailed documentation
• Add more tests
• Add support for http actions

Contributing

Feel free to open an issue or a pull request.