Teloce-Py
Build interactive Python applications with .vel files. Teloce-Py compiles
the template, browser behavior, and component CSS into normal browser assets;
Flask, FastAPI, Django, or Flaxon remains responsible for routes, APIs,
databases, authentication, and security.
The problem it solves
Python teams often maintain a backend template system and a separate frontend
toolchain just to build forms, dashboards, and reactive UI. Teloce keeps the
interactive part in readable .vel components while preserving the Python
framework you already use.
Fast workflow: write .vel, run python app.py
static/js/App.vel -> app.py builds it -> Python serves the page -> browser runs it
Recommended layout:
my-app/
├── app.py
├── teloce.config.json
├── static/js/App.vel # authored source
├── templates/index.html # HTML shell and #app mount
└── dist/ # generated output; never edit by hand
Copy-paste Flask example
Install:
python -m pip install teloce-py Flask
Create static/js/App.vel:
<template>
<main class="chat">
<h1>Quick chat</h1>
<ul><li v-for="message in messages" :key="message.id">{{ message.text }}</li></ul>
<form @submit.prevent="send">
<input v-model="draft" aria-label="Message" />
<button>Send</button>
</form>
</main>
</template>
<script>
export default {
data() { return { draft: "", messages: [] }; },
async mounted() { this.messages = await fetch("/api/messages").then(r => r.json()); },
methods: {
async send() {
const text = this.draft.trim();
if (!text) return;
const message = await fetch("/api/messages", {
method: "POST", headers: {"Content-Type": "application/json"},
body: JSON.stringify({text})
}).then(r => r.json());
this.messages = [...this.messages, message];
this.draft = "";
}
}
};
</script>
<style scoped>
.chat { max-width: 40rem; margin: 3rem auto; padding: 1rem; font: 1rem system-ui; }
form { display: flex; gap: .5rem; } input { flex: 1; padding: .7rem; }
</style>
Create app.py. It builds automatically, so the only development command is
python app.py:
from pathlib import Path
from flask import Flask, jsonify, render_template, request
from teloce.build import build_project
ROOT = Path(__file__).parent
build_project(ROOT, out_dir=ROOT / "dist", options={"dev": True})
app = Flask(__name__, static_folder="dist/static", static_url_path="/static")
messages = []
@app.get("/")
def home():
return render_template("index.html")
@app.get("/api/messages")
def list_messages():
return jsonify(messages)
@app.post("/api/messages")
def create_message():
text = str((request.get_json(silent=True) or {}).get("text", "")).strip()
if not text or len(text) > 500:
return jsonify({"error": "Message must contain 1-500 characters"}), 400
message = {"id": len(messages) + 1, "text": text}
messages.append(message)
return jsonify(message), 201
if __name__ == "__main__":
app.run(debug=True)
Create templates/index.html:
<!doctype html><html><head><meta charset="utf-8"><title>Quick chat</title></head>
<body><div id="app"></div>
<script type="module">import { mount } from "{{ url_for('static', filename='js/App.js') }}"; mount("#app");</script>
</body></html>
Run it:
python app.py
Open http://127.0.0.1:5000. This is a real Flask API and compiled .vel
UI; it uses in-memory messages for a small demonstration. Add a database,
authentication, CSRF protection, and rate limits before production use.
Flaxon and WebSockets
Flaxon is the async option when the app needs rooms and real-time events. The
verified pattern is accept(), join(room), receive_json(), and
broadcast_json(room, data):
from flaxon import Flaxon
from flaxon.websocket import WebSocket
app = Flaxon("chat", debug=True)
@app.websocket("/ws/chat/<room_id>")
async def chat(socket: WebSocket, room_id: str):
await socket.accept()
await socket.join(room_id)
try:
async for message in socket.iter_json():
await socket.broadcast_json(room_id, {
"text": str(message.get("text", ""))[:500]
})
finally:
await socket.leave(room_id)
Serve the generated asset directory with Flaxon and run the framework's
Flaxon command (python -m flaxon run app:app --reload). Use wss:// behind
HTTPS. The Flask example above intentionally uses ordinary HTTP so it can be
started reliably with only python app.py.
Release checks
teloce lint --strict
teloce build --source-map --hash-assets --bundle --report
python -m pytest -q
python -m build --sdist --wheel
python -m twine check dist/*
Use --bundler esbuild for whole-program tree-shaking, code splitting, and
minification. Teloce supports limited common TypeScript syntax stripping, not
full TypeScript type-checking. Read the documentation,
optimized structure lesson, and
all examples: examples/flask-chat, examples/config-driven-flask,
examples/fastapi-cms, examples/django-scanner,
examples/django-admin-vel, examples/flaxon-network, and examples/teloce-gallery.
Status
Teloce-Py is beta software. Pin versions and test generated browser assets in the Python framework and deployment platform you support.
License
MIT
1 maintainer
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