晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/self/root/lib/python3.6/site-packages/tuned/utils/plugin_loader.py
import tuned.logs
import os

__all__ = ["PluginLoader"]

log = tuned.logs.get()

class PluginLoader(object):
	__slots__ = ["_namespace", "_prefix", "_interface"]

	def _set_loader_parameters(self):
		"""
		This method has to be implemented in child class and should
		set _namespace, _prefix, and _interface member attributes.
		"""
		raise NotImplementedError()

	def __init__(self):
		super(PluginLoader, self).__init__()

		self._namespace = None
		self._prefix = None
		self._interface = None
		self._set_loader_parameters()
		assert type(self._namespace) is str
		assert type(self._prefix) is str
		assert type(self._interface) is type and issubclass(self._interface, object)

	def load_plugin(self, plugin_name):
		assert type(plugin_name) is str
		module_name = "%s.%s%s" % (self._namespace, self._prefix, plugin_name)
		return self._get_class(module_name)

	def _get_class(self, module_name):
		log.debug("loading module %s" % module_name)
		module = __import__(module_name)
		path = module_name.split(".")
		path.pop(0)

		while len(path) > 0:
			module = getattr(module, path.pop(0))

		for name in module.__dict__:
			cls = getattr(module, name)
			if type(cls) is type and issubclass(cls, self._interface):
				return cls

		raise ImportError("Cannot find the plugin class.")

	def load_all_plugins(self):
		plugins_package = __import__(self._namespace)
		plugin_clss = []
		for module_name in os.listdir(plugins_package.plugins.__path__[0]):
			try:
				module_name = os.path.splitext(module_name)[0]
				if not module_name.startswith("plugin_"):
					continue
				plugin_class = self._get_class(
					"%s.%s" % (self._namespace, module_name)
					)
				if plugin_class not in plugin_clss:
					plugin_clss.append(plugin_class)
			except ImportError:
				pass
		return plugin_clss

haha - 2025