我有一个用Python编写的应用程序,它是由相当专业的观众(科学家)使用的。
我正在寻找一个好方法,使应用程序可扩展的用户,即脚本/插件架构。
I am looking for something extremely lightweight. Most scripts, or plugins, are not going to be developed and distributed by a third-party and installed, but are going to be something whipped up by a user in a few minutes to automate a repeating task, add support for a file format, etc. So plugins should have the absolute minimum boilerplate code, and require no 'installation' other than copying to a folder (so something like setuptools entry points, or the Zope plugin architecture seems like too much.)
是否已经有类似的系统存在,或者是否有项目实现了类似的方案,我应该看看想法/灵感?
你也可以看看“基础工作”。
其思想是围绕可重用组件(称为模式和插件)构建应用程序。插件是派生自GwBasePattern的类。
这里有一个基本的例子:
from groundwork import App
from groundwork.patterns import GwBasePattern
class MyPlugin(GwBasePattern):
def __init__(self, app, **kwargs):
self.name = "My Plugin"
super().__init__(app, **kwargs)
def activate(self):
pass
def deactivate(self):
pass
my_app = App(plugins=[MyPlugin]) # register plugin
my_app.plugins.activate(["My Plugin"]) # activate it
还有更高级的模式来处理命令行接口、信号或共享对象。
foundation可以通过编程方式将插件绑定到应用程序中,如上面所示,也可以通过setuptools自动查找插件。包含插件的Python包必须使用一个特殊的入口点groundwork.plugin声明这些插件。
这是文件。
免责声明:我是《基础》的作者之一。
扩展@edomaur的回答,我建议看看simple_plugins(无耻的插件),这是一个简单的插件框架,灵感来自Marty Alchin的工作。
一个基于项目README的简短使用示例:
# All plugin info
>>> BaseHttpResponse.plugins.keys()
['valid_ids', 'instances_sorted_by_id', 'id_to_class', 'instances',
'classes', 'class_to_id', 'id_to_instance']
# Plugin info can be accessed using either dict...
>>> BaseHttpResponse.plugins['valid_ids']
set([304, 400, 404, 200, 301])
# ... or object notation
>>> BaseHttpResponse.plugins.valid_ids
set([304, 400, 404, 200, 301])
>>> BaseHttpResponse.plugins.classes
set([<class '__main__.NotFound'>, <class '__main__.OK'>,
<class '__main__.NotModified'>, <class '__main__.BadRequest'>,
<class '__main__.MovedPermanently'>])
>>> BaseHttpResponse.plugins.id_to_class[200]
<class '__main__.OK'>
>>> BaseHttpResponse.plugins.id_to_instance[200]
<OK: 200>
>>> BaseHttpResponse.plugins.instances_sorted_by_id
[<OK: 200>, <MovedPermanently: 301>, <NotModified: 304>, <BadRequest: 400>, <NotFound: 404>]
# Coerce the passed value into the right instance
>>> BaseHttpResponse.coerce(200)
<OK: 200>
module_example.py:
def plugin_main(*args, **kwargs):
print args, kwargs
loader.py:
def load_plugin(name):
mod = __import__("module_%s" % name)
return mod
def call_plugin(name, *args, **kwargs):
plugin = load_plugin(name)
plugin.plugin_main(*args, **kwargs)
call_plugin("example", 1234)
它当然是“最小的”,它绝对没有错误检查,可能有无数的安全问题,它不是很灵活-但它应该告诉你一个Python插件系统可以多么简单。
你可能也想看看imp模块,尽管你可以用__import__, os。Listdir和一些字符串操作。
当我搜索Python Decorators时,发现了一个简单但有用的代码片段。它可能不符合你的需求,但非常鼓舞人心。
Scipy高级Python#插件注册系统
class TextProcessor(object):
PLUGINS = []
def process(self, text, plugins=()):
if plugins is ():
for plugin in self.PLUGINS:
text = plugin().process(text)
else:
for plugin in plugins:
text = plugin().process(text)
return text
@classmethod
def plugin(cls, plugin):
cls.PLUGINS.append(plugin)
return plugin
@TextProcessor.plugin
class CleanMarkdownBolds(object):
def process(self, text):
return text.replace('**', '')
用法:
processor = TextProcessor()
processed = processor.process(text="**foo bar**", plugins=(CleanMarkdownBolds, ))
processed = processor.process(text="**foo bar**")