old_contents: from socketio.namespace import BaseNamespace
  from socketio import socketio_manage
  from socketio.mixins import BroadcastMixin
  
  
  def index(request):
      """ Base view to load our template """
      return {}
  
  
  class NamedUsersRoomsMixin(BroadcastMixin):
      def __init__(self, *args, **kwargs):
          super(NamedUsersRoomsMixin, self).__init__(*args, **kwargs)
          if 'rooms' not in self.session:
              self.session['rooms'] = set()  # a set of simple strings
              self.session['nickname'] = 'guest123'
  
      def join(self, room):
          """Lets a user join a room on a specific Namespace."""
          self.socket.rooms.add(self._get_room_name(room))
  
      def leave(self, room):
          """Lets a user leave a room on a specific Namespace."""
          self.socket.rooms.remove(self._get_room_name(room))
  
      def _get_room_name(self, room):
          return self.ns_name + '_' + room
  
      def emit_to_room(self, event, args, room):
          """This is sent to all in the room (in this particular Namespace)"""
          pkt = dict(type="event",
                     name=event,
                     args=args,
                     endpoint=self.ns_name)
          room_name = self._get_room_name(room)
          for sessid, socket in self.socket.server.sockets.iteritems():
              if not hasattr(socket, 'rooms'):
                  continue
              if room_name in socket.rooms:
                  socket.send_packet(pkt)
  
  
  class ChatNamespace(BaseNamespace, NamedUsersRoomsMixin):
      def on_chat(self, msg):
          self.broadcast_event('chat', msg)
  
      def recv_connect(self):
          self.broadcast_event('user_connect')
  
      def recv_disconnect(self):
          self.broadcast_event('user_disconnect')
          self.disconnect(silent=True)
  
  
  def socketio_service(request):
      retval = socketio_manage(request.environ,
          {
              '/chat': ChatNamespace,
          }, request=request
      )
  
      return retval
  
  
new_contents: from socketio.namespace import BaseNamespace
  from socketio import socketio_manage
  from socketio.mixins import BroadcastMixin
  
  
  def index(request):
      """ Base view to load our template """
      return {}
  
  
  class NamedUsersRoomsMixin(BroadcastMixin):
      def __init__(self, *args, **kwargs):
          super(NamedUsersRoomsMixin, self).__init__(*args, **kwargs)
          if 'rooms' not in self.session:
              self.session['rooms'] = set()  # a set of simple strings
              self.session['nickname'] = 'guest123'
  
      def join(self, room):
          """Lets a user join a room on a specific Namespace."""
          self.socket.rooms.add(self._get_room_name(room))
  
      def leave(self, room):
          """Lets a user leave a room on a specific Namespace."""
          self.socket.rooms.remove(self._get_room_name(room))
  
      def _get_room_name(self, room):
          return self.ns_name + '_' + room
  
      def emit_to_room(self, event, args, room):
          """This is sent to all in the room (in this particular Namespace)"""
          pkt = dict(type="event",
                     name=event,
                     args=args,
                     endpoint=self.ns_name)
          room_name = self._get_room_name(room)
          for sessid, socket in self.socket.server.sockets.iteritems():
              if not hasattr(socket, 'rooms'):
                  continue
              if room_name in socket.rooms:
                  socket.send_packet(pkt)
  
  
  class ChatNamespace(BaseNamespace, NamedUsersRoomsMixin):
      def on_chat(self, msg):
          self.broadcast_event('chat', msg)
  
      def recv_connect(self):
          self.broadcast_event('user_connect')
  
      def recv_disconnect(self):
          self.broadcast_event('user_disconnect')
          self.disconnect(silent=True)
          
      def on_join(self, channel):
          self.join(channel)
  
  
  
  def socketio_service(request):
      retval = socketio_manage(request.environ,
          {
              '/chat': ChatNamespace,
          }, request=request
      )
  
      return retval
  
  
subject: Update examples/simple_pyramid_chat/chatter2/views.py