remove obsolete Python 2.x style constructs

example/templates/index.html

@@ -56,7 +56,7 @@
             // These accept data from the user and send it to the server in a
             // variety of ways
             $('form#emit').submit(function(event) {
-                socket.emit('my_event_foo', {data: $('#emit_data').val()});
+                socket.emit('my_event', {data: $('#emit_data').val()});
                 return false;
             });
             $('form#broadcast').submit(function(event) {

src/flask_socketio/__init__.py

@@ -33,15 +33,13 @@ class _SocketIOMiddleware(socketio.WSGIApp):
     """
     def __init__(self, socketio_app, flask_app, socketio_path='socket.io'):
         self.flask_app = flask_app
-        super(_SocketIOMiddleware, self).__init__(socketio_app,
-                                                  flask_app.wsgi_app,
-                                                  socketio_path=socketio_path)
+        super().__init__(socketio_app, flask_app.wsgi_app,
+                         socketio_path=socketio_path)
 
     def __call__(self, environ, start_response):
         environ = environ.copy()
         environ['flask.app'] = self.flask_app
-        return super(_SocketIOMiddleware, self).__call__(environ,
-                                                         start_response)
+        return super().__call__(environ, start_response)
 
 
 class _ManagedSession(dict, SessionMixin):
@@ -51,7 +49,7 @@ class _ManagedSession(dict, SessionMixin):
     pass
 
 
-class SocketIO(object):
+class SocketIO:
     """Create a Flask-SocketIO server.
 
     :param app: The flask application instance. If the application instance
@@ -204,7 +202,7 @@ def init_app(self, app, **kwargs):
             if url:
                 if url.startswith(('redis://', "rediss://")):
                     queue_class = socketio.RedisManager
-                elif url.startswith(('kafka://')):
+                elif url.startswith('kafka://'):
                     queue_class = socketio.KafkaManager
                 elif url.startswith('zmq'):
                     queue_class = socketio.ZmqManager
@@ -220,7 +218,7 @@ def init_app(self, app, **kwargs):
             # changes when it is invoked inside or outside the app context
             # so here to prevent any ambiguities we replace it with wrappers
             # that ensure that the app context is always present
-            class FlaskSafeJSON(object):
+            class FlaskSafeJSON:
                 @staticmethod
                 def dumps(*args, **kwargs):
                     with app.app_context():

src/flask_socketio/namespace.py

@@ -3,7 +3,7 @@
 
 class Namespace(_Namespace):
     def __init__(self, namespace=None):
-        super(Namespace, self).__init__(namespace)
+        super().__init__(namespace)
         self.socketio = None
 
     def _set_socketio(self, socketio):

src/flask_socketio/test_client.py

@@ -5,7 +5,7 @@
 from werkzeug.test import EnvironBuilder
 
 
-class SocketIOTestClient(object):
+class SocketIOTestClient:
     """
     This class is useful for testing a Flask-SocketIO server. It works in a
     similar way to the Flask Test Client, but adapted to the Socket.IO server.

test_socketio.py

@@ -439,7 +439,7 @@ def test_emit(self):
     def test_emit_binary(self):
         client = socketio.test_client(app, auth={'foo': 'bar'})
         client.get_received()
-        client.emit('my custom event', {u'a': b'\x01\x02\x03'})
+        client.emit('my custom event', {'a': b'\x01\x02\x03'})
         received = client.get_received()
         self.assertEqual(len(received), 1)
         self.assertEqual(len(received[0]['args']), 1)