quadkit

Async-first DI/IoC framework for Python — core package.

Overview

Quadkit is the foundation package for the wider Quadkit ecosystem. It provides the DI/IoC container, application lifecycle, configuration system, provider protocol, exception hierarchy, and structured logging foundation.

Async-first by design: application boot, provider lifecycle, I/O paths, and resolution workflows are built for async Python. Use Application.boot(...) to assemble modules and providers into a running app.

Install

uv add quadkit
# Optional extras
uv add "quadkit[security]"

Quick Start

from quadkit import Application
from quadkit.di.module import Module, module
from quadkit.app.standard import StandardModule


@module(imports=[StandardModule.configure()])
class AppModule(Module):
    pass


async with Application.boot(modules=[AppModule]) as app:
    # use app.container to resolve services
    ...

Configuration

Zero-config usage: Call StandardModule.configure() with no arguments to use defaults.

Option 1 — YAML file

# application.yaml
app_name: my-app
debug: false

Option 2 — Profiles + Environment Variables (recommended)

export QK_PROFILE=production
# Environment variables for each field

Option 3 — Python

from quadkit.config.main import QuadkitConfig

config = QuadkitConfig(...)
StandardModule.configure(config_class=QuadkitConfig)

Module Factory Methods

Key Features

• DI Container — register services as singleton, transient, or scoped; resolve via await container.resolve(ServiceType)
• Provider Lifecycle — register(), boot(), shutdown() hooks with priority ordering
• Result Pattern — Result[T, E] for expected domain failures, exceptions for infrastructure errors
• Module System — compose applications from reusable modules with explicit exports
• Structured Logging — structlog-based logging via get_logger(__name__)
• Configuration — Pydantic-based config with YAML, environment variables, and profile support

Testing

async with Application.boot(modules=[StandardModule.configure()]) as app:
    # your test code
    ...

Key Source Files