Straight Plugin is very easy.
Straight Plugin provides a type of plugin you can create from almost any existing Python modules, and an easy way for outside developers to add functionality and customization to your projects with their own plugins.
Using any available plugins is a snap.
from straight.plugin import load plugins = load('theproject.plugins', subclasses=FileHandler) handlers = plugins.produce() for line in open(filename): print handlers.pipe(line)
And, writing plugins is just as easy.
from theproject import FileHandler class LineNumbers(FileHandler): def __init__(self): self.lineno = 0 def pipe(line): self.lineno += 1 return "%04d %s" % (self.lineno, line)
Plugins are found from a namespace, which means the above example would find any FileHandler classes defined in modules you might import as theproject.plugins.default or theproject.plugins.extra. Through the magic of namespace packages, we can even split these up into separate installations, even managed by different teams. This means you can ship a project with a set of default plugins implementing its behavior, and allow other projects to hook in new functionality simply by shipping their own plugins under the same namespace.