Rick van Hattem
40 lines
823 B
ReStructuredText
40 lines
823 B
ReStructuredText
>>> import abc
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>>> class Plugins(abc.ABCMeta):
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... plugins = dict()
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...
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... def __new__(metaclass, name, bases, namespace):
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... cls = abc.ABCMeta.__new__(metaclass, name, bases,
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... namespace)
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... if isinstance(cls.name, str):
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... metaclass.plugins[cls.name] = cls
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... return cls
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...
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... @classmethod
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... def get(cls, name):
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... return cls.plugins[name]
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>>> class PluginBase(metaclass=Plugins):
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... @property
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... @abc.abstractmethod
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... def name(self):
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... raise NotImplemented()
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>>> class PluginA(PluginBase):
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... name = 'a'
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>>> class PluginB(PluginBase):
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... name = 'b'
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>>> Plugins.get('a')
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<class '...PluginA'>
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>>> Plugins.plugins
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{'a': <class '...PluginA'>,
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'b': <class '...PluginB'>}
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