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 : //lib/python3.6/site-packages/pydbus/error.py
from gi.repository import GLib, Gio


def register_error(name, domain, code):
	"""Register and map decorated exception class to a DBus error."""
	def decorated(cls):
		error_registration.register_error(cls, name, domain, code)
		return cls

	return decorated


def map_error(error_name):
	"""Map decorated exception class to a DBus error."""
	def decorated(cls):
		error_registration.map_error(cls, error_name)
		return cls

	return decorated


def map_by_default(cls):
	"""Map decorated exception class to all unknown DBus errors."""
	error_registration.map_by_default(cls)
	return cls


class ErrorRegistration(object):
	"""Class for mapping exceptions to DBus errors."""

	_default = None
	_map = dict()
	_reversed_map = dict()

	def map_by_default(self, exception_cls):
		"""Set the exception class as a default."""
		self._default = exception_cls

	def map_error(self, exception_cls, name):
		"""Map the exception class to a DBus name."""
		self._map[name] = exception_cls
		self._reversed_map[exception_cls] = name

	def register_error(self, exception_cls, name, domain, code):
		"""Map and register the exception class to a DBus name."""
		self.map_error(exception_cls, name)
		return Gio.DBusError.register_error(domain, code, name)

	def is_registered_exception(self, obj):
		"""Is the exception registered?"""
		return obj.__class__ in self._reversed_map

	def get_dbus_name(self, obj):
		"""Get the DBus name of the exception."""
		return self._reversed_map.get(obj.__class__)

	def get_exception_class(self, name):
		"""Get the exception class mapped to the DBus name."""
		return self._map.get(name, self._default)

	def transform_message(self, name, message):
		"""Transform the message of the exception."""
		prefix = "{}:{}: ".format("GDBus.Error", name)

		if message.startswith(prefix):
			return message[len(prefix):]

		return message

	def transform_exception(self, e):
		"""Transform the remote error to the exception."""
		if not isinstance(e, GLib.Error):
			return e

		if not Gio.DBusError.is_remote_error(e):
			return e

		# Get DBus name of the error.
		name = Gio.DBusError.get_remote_error(e)
		# Get the exception class.
		exception_cls = self.get_exception_class(name)

		# Return the original exception.
		if not exception_cls:
			return e

		# Return new exception.
		message = self.transform_message(name, e.message)
		exception = exception_cls(message)
		exception.dbus_name = name
		exception.dbus_domain = e.domain
		exception.dbus_code = e.code
		return exception


# Default error registration.
error_registration = ErrorRegistration()

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