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 : //usr/lib/python3.6/site-packages/pydbus/subscription.py
from gi.repository import Gio
from .exitable import ExitableWithAliases

class Subscription(ExitableWithAliases("unsubscribe", "disconnect")):
	Flags = Gio.DBusSignalFlags
	__slots__ = ()

	def __init__(self, con, sender, iface, member, object, arg0, flags, callback):
		id = con.signal_subscribe(sender, iface, member, object, arg0, flags, callback)
		self._at_exit(lambda: con.signal_unsubscribe(id))

class SubscriptionMixin(object):
	__slots__ = ()
	SubscriptionFlags = Subscription.Flags

	def subscribe(self, sender=None, iface=None, signal=None, object=None, arg0=None, flags=0, signal_fired=None):
		"""Subscribes to matching signals.

		Subscribes to signals on connection and invokes signal_fired callback
		whenever the signal is received.

		To receive signal_fired callback, you need an event loop.
		https://github.com/LEW21/pydbus/blob/master/doc/tutorial.rst#setting-up-an-event-loop

		Parameters
		----------
		sender : string, optional
			Sender name to match on (unique or well-known name) or None to listen from all senders.
		iface : string, optional
			Interface name to match on or None to match on all interfaces.
		signal : string, optional
			Signal name to match on or None to match on all signals.
		object : string, optional
			Object path to match on or None to match on all object paths.
		arg0 : string, optional
			Contents of first string argument to match on or None to match on all kinds of arguments.
		flags : SubscriptionFlags, optional
		signal_fired : callable, optional
			Invoked when there is a signal matching the requested data.
			Parameters: sender, object, iface, signal, params

		Returns
		-------
		Subscription
			An object you can use as a context manager to unsubscribe from the signal later.

		See Also
		--------
		See https://developer.gnome.org/gio/2.44/GDBusConnection.html#g-dbus-connection-signal-subscribe
		for more information.
		"""
		callback = (lambda con, sender, object, iface, signal, params: signal_fired(sender, object, iface, signal, params.unpack())) if signal_fired is not None else lambda *args: None
		return Subscription(self.con, sender, iface, signal, object, arg0, flags, callback)

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