wd-di 0.2.2

.NET Core Dependency Injection for Python

WD-DI

.NET Style Dependency Injection for Python

WD-DI brings the robust and flexible dependency injection patterns of .NET to your Python applications, with no external library dependencies, just Python's standard library.

Full documentation can be found at https://whiteducksoftware.github.io/wd-di/ (or in the /docs directory).

For beginners, the Core Concepts and Tutorials sections in the documentation are a great place to start to understand not just how to use DI, but why it's beneficial!

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Why WD-DI? 🤔

• Simplified Dependency Management: Effortlessly manage object creation and lifecycles.
• Enhanced Testability: Easily mock dependencies for robust unit tests.
• Modular Architecture: Build loosely coupled, maintainable, and scalable applications.
• Familiar Patterns: Leverage .NET-inspired DI concepts like service lifetimes (Singleton, Scoped, Transient), constructor injection, and the Options pattern for configuration.
• Pythonic and Lightweight: Clean, intuitive API that integrates smoothly into your Python projects.

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Installation 📦

pip install wd-di

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Quick Example: The Power of WD-DI 🚀

Experience clean, decoupled code with intuitive type-hinted dependency resolution:

from wd.di import ServiceCollection

# 1. Create a service collection
services = ServiceCollection()

# 2. Define your services (interfaces optional but recommended)
class IEmailService:
    def send(self, message: str): ...

@services.singleton(IEmailService) # Register EmailService as a singleton for IEmailService
class EmailService(IEmailService):
    def send(self, message: str):
        print(f"Sending email: {message}")

@services.transient() # Register NotifierService as transient (new instance each time)
class NotifierService:
    def __init__(self, emailer: IEmailService): # Dependency injected here!
        self._emailer = emailer

    def notify_admin(self, alert: str):
        self._emailer.send(f"Admin Alert: {alert}")

# 3. Build the provider and resolve your top-level service
provider = services.build_service_provider()
notifier = provider.get_service(NotifierService) # Type is inferred!

# 4. Use your services
notifier.notify_admin("System critical!")
# Output: Sending email: Admin Alert: System critical!

Dive into the full documentation to explore service lifetimes, configuration, middleware, and more!

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Contributing 🤝

Contributions are welcome! Please see the main documentation site for details on how to contribute, report issues, or request features.

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License 📜

This project is licensed under the MIT License. See the LICENSE file for details.