arvel 0.63.3

A batteries-included web framework for Python — async-first, type-safe, modular.

arvel

The batteries-included, async-first web framework for Python — type-safe and modular.

Expressive facades, an Active-Record ORM, a real queue, auth, mail, caching, views and a powerful CLI — one coherent, fully-typed, async/await-native toolkit. You get a productive, high-level developer experience without giving up Python's type system or performance.

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Install

uv add arvel                 # light core — no heavy dependencies
uv add 'arvel[standard]'     # the common set: http, db, queue, cache, view, mail, image
uv add 'arvel[all]'          # everything

Requires Python 3.14+. Capabilities are opt-in extras — you install only what you use, and import arvel stays light because engines are imported lazily.

Quickstart

arvel new blog            # scaffold a new app
cd blog && uv sync
source .venv/bin/activate # activate the virtualenv
arvel serve --reload      # http://127.0.0.1:8000

arvel new gives you a runnable project: an ASGI entrypoint, a bootstrap/app.py factory, web/api route groups, config files, a User model with migrations and a factory, and a test suite.

A taste

Routing — define routes with the Route facade; web (stateful) and api (JSON) groups:

from arvel import Route, Schema

async def show(request):
    return {"hello": request.path_param("name")}

Route.get("/hello/{name}", show, name="hello")

class CreatePost(Schema):      # typed request/response → automatic OpenAPI at /schema
    title: str

async def store(request, data: CreatePost) -> CreatePost:
    return data

Route.post("/posts", store, name="posts.store")

ORM — an Active-Record model on SQLAlchemy Core:

from arvel import Model

class Post(Model):
    __fillable__ = ["title", "body"]
    __casts__    = {"published": "bool", "meta": "json"}

post = await Post.create(title="Hello", body="…")
posts = await Post.where("published", True).order_by("created_at", "desc").get()
await Post.with_("author").get()          # eager-load relations — no N+1

Validation — concise rules, returning only the validated data:

from arvel import Validator

data = Validator(request_body, {
    "email": "required|email",
    "age":   "nullable|integer|min:18",
}).validate()

Queues, authorization, mail, cache — the facades you'd expect, all async:

from arvel import Job, Gate, Mail, Cache

await SendWelcome.dispatch(user_id=42)            # background job
await SendWelcome.dispatch_after(600, user_id=42) # …or run it in 10 minutes
if await Gate.allows("update", post): ...         # authorization
await Mail.to(user).send(WelcomeMail())           # mailables
await Cache.remember("stats", 300, compute_stats) # cache-aside

More: notifications, events & listeners, task scheduling, file storage (local/S3/GCS/Azure), localization, server-rendered views, and a rich Str/Arr/Collection helper set.

Why arvel

• Batteries included, async-first. Routing, ORM, queue, cache, auth, mail, views, CLI — one coherent DX, built async/await-native from the ground up.
• Type-safe. Strict typing across the public API, so your editor and CI catch mistakes before runtime — no stub-chasing.
• Lightweight & modular. One package, opt-in extras, lazy imports. You pay only for what you use, and the CLI stays fast.
• Convention over configuration. Sensible defaults, expressive facades, and a familiar project layout — scaffold and ship without wiring boilerplate.

The four gates

Engineering guarantees enforced in CI from the first commit:

• G1 — boundaries. import-linter keeps modules honest: kernel isolation, a layered DAG, and no heavy import at module load.
• G2 — startup. import arvel pulls zero heavy libraries; the CLI stays snappy.
• G3 — types. Strict mypy and pyright on every public API.
• G4 — stack fidelity. Each capability is built on its mandated engine (Litestar, SQLAlchemy Core, whenever, Typer, …) — verified by a per-module test.

Extras

Extra	Adds
http, server	Litestar routing · the granian/uvicorn dev server
sqlite, postgres, mysql	SQLAlchemy + the matching async driver + Alembic
queue, queue-redis, queue-amqp	taskiq jobs · Redis broker · RabbitMQ/AMQP broker
redis	cashews caching (Redis backend)
jwt, oauth, 2fa	JWT tokens · OAuth providers · TOTP two-factor (auth is core)
mail, notifications	SMTP mail · multi-channel notifications (Apprise)
view	Jinja2 templating
s3, gcs, azure, supabase	filesystem disks
image, video, media	media handling (Pillow / PyAV)
search, vector	Meilisearch · pgvector
i18n, telemetry	Babel localization · OpenTelemetry/Sentry

arvel[standard] bundles the everyday set; arvel[all] installs everything.

Development

uv venv && uv pip install -e '.[dev]'
./tools/validate.sh    # ruff · mypy · pyright · import-linter · bandit · pip-audit · pytest

Inspired by

If you're coming from PHP, arvel will feel familiar: facades, the service container, providers, migrations, factories, gates & policies, and a project layout are all here. Arvel is built natively for async Python, embraces the type system end to end, and stands on best-in-class Python engines (Litestar · SQLAlchemy Core · Alembic · whenever · Typer · taskiq · Babel · msgspec · cashews · fsspec · Jinja2).

License

MIT.