Python Dependency Injection Framework

Question

Is there a framework equivalent to Guice (http://code.google.com/p/google-guice) for Python?

Answer 1

I haven't used it, but the Spring Python framework is based on Spring and implements Inversion of Control.

There also appears to be a Guice in Python project: snake-guice

Answer 2

Besides that:

1. Zope component architekture
2. pyContainer

Answer 3

Spring Python is an offshoot of the Java-based Spring Framework and Spring Security, targeted for Python. This project currently contains the following features:

• Inversion Of Control (dependency injection) - use either classic XML, or the python @Object decorator (similar to the Spring JavaConfig subproject) to wire things together. While the @Object format isn't identical to the Guice style (centralized wiring vs. wiring information in each class), it is a valuable way to wire your python app.
• Aspect-oriented Programming - apply interceptors in a horizontal programming paradigm (instead of vertical OOP inheritance) for things like transactions, security, and caching.
• DatabaseTemplate - Reading from the database requires a monotonous cycle of opening cursors, reading rows, and closing cursors, along with exception handlers. With this template class, all you need is the SQL query and row-handling function. Spring Python does the rest.
• Database Transactions - Wrapping multiple database calls with transactions can make your code hard to read. This module provides multiple ways to define transactions without making things complicated.
• Security - Plugin security interceptors to lock down access to your methods, utilizing both authentication and domain authorization.
• Remoting - It is easy to convert your local application into a distributed one. If you have already built your client and server pieces using the IoC container, then going from local to distributed is just a configuration change.
• Samples - to help demonstrate various features of Spring Python, some sample applications have been created:
  • PetClinic - Spring Framework's sample web app has been rebuilt from the ground up using python web containers including: CherryPy. Go check it out for an example of how to use this framework. (NOTE: Other python web frameworks will be added to this list in the future).
  • Spring Wiki - Wikis are powerful ways to store and manage content, so we created a simple one as a demo!
  • Spring Bot - Use Spring Python to build a tiny bot to manage the IRC channel of your open source project.

Answer 4

As an alternative to monkeypatching, I like DI. A nascent project such as http://code.google.com/p/snake-guice/ may fit the bill.

Or http://www.dennis-kempin.de/python/dependency-injection-in-python/

Answer 5

If you just want to do dependency injection in Python, you don't need a framework. Have a look at Dependency Injection the Python Way. It's really quick and easy, and only c. 50 lines of code.

Answer 6

There is a somewhat Guicey python-inject project. It's quite active, and a LOT less code then Spring-python, but then again, I haven't found a reason to use it yet.