Handle a user leaving a group chat.

group.py

@@ -32,4 +32,4 @@ class Group():
 		self.joined = False
 
 		self.nick = "me"
-		self.participants = { }
+		self.participants = []

session.py

@@ -484,12 +484,34 @@ class Session(YowsupApp):
 		self.bot.send("You have been added to group: %s@%s (%s)"
 					  % (self._shortenGroupId(room), subject, self.backend.spectrum_jid))
 
+	# Called by superclass
 	def onParticipantsAddedToGroup(self, group):
 		self.logger.debug("Participants added to group: %s", group)
 		room = group.getGroupId().split('@')[0]
 		self.groups[room].participants.extend(group.getParticipants())
 		self._refreshParticipants(room)
 
+	# Called by superclass
+	def onParticipantsRemovedFromGroup(self, room, participants):
+		self.logger.debug("Participants removed from group: %s, %s",
+				room, participants)
+		group = self.groups[room]
+		for jid in participants:
+			group.participants.remove(jid)
+			buddy = jid.split("@")[0]
+			try:
+				nick = self.buddies[buddy].nick
+			except KeyError:
+				nick = buddy
+			if nick == "":
+				nick = buddy
+			if buddy == self.legacyName:
+				nick = group.nick
+			flags = protocol_pb2.PARTICIPANT_FLAG_NONE
+			self.backend.handleParticipantChanged(
+					self.user, nick, self._shortenGroupId(room), flags,
+					protocol_pb2.STATUS_NONE, buddy)
+
 	def onPresenceReceived(self, _type, name, jid, lastseen):
 		self.logger.info("Presence received: %s %s %s %s", _type, name, jid, lastseen)
 		buddy = jid.split("@")[0]
@@ -643,7 +665,6 @@ class Session(YowsupApp):
 			group = self.groups[room]
 			for jid in group.participants:
 				buddy = jid.split("@")[0]
-				self.logger.info("Added %s to room %s", buddy, room)
 				try:
 					nick = self.buddies[buddy].nick
 				except KeyError:

yowsupwrapper.py

@@ -501,6 +501,15 @@ class YowsupApp(object):
 		"""Called when participants have been added to a group"""
 		pass
 
+	def onParticipantsRemovedFromGroup(self, group, participants):
+		"""Called when participants have been removed from a group
+		
+		Args:
+			- group: (str) id of the group (e.g. 27831788123-144024456)
+			- participants: (list) jids of participants that are removed
+		"""
+		pass
+
 	def sendEntity(self, entity):
 		"""Sends an entity down the stack (as if YowsupAppLayer called toLower)"""
 		self.stack.broadcastEvent(YowLayerEvent(YowsupAppLayer.TO_LOWER_EVENT,
@@ -596,12 +605,17 @@ class YowsupAppLayer(YowInterfaceLayer):
 		"""
 		Sends ack automatically
 		"""
-		self.logger.debug("Received notification: %s", entity)
+		self.logger.debug("Received notification (%s): %s", type(entity), entity)
 		self.toLower(entity.ack())
 		if isinstance(entity, CreateGroupsNotificationProtocolEntity):
 			self.caller.onAddedToGroup(entity)
 		elif isinstance(entity, AddGroupsNotificationProtocolEntity):
 			self.caller.onParticipantsAddedToGroup(entity)
+		elif isinstance(entity, RemoveGroupsNotificationProtocolEntity):
+			self.caller.onParticipantsRemovedFromGroup(
+					entity.getGroupId().split('@')[0],
+					entity.getParticipants().keys()
+			)
 
 	@ProtocolEntityCallback('message')
 	def onMessageReceived(self, entity):