diff --git a/devicehive/api_handler.py b/devicehive/api_handler.py
index da9760f..29eb5b3 100644
--- a/devicehive/api_handler.py
+++ b/devicehive/api_handler.py
@@ -16,7 +16,7 @@ class ApiHandler(Handler):
 
     def __init__(self, transport, auth, handler_class, handler_args,
                  handler_kwargs):
-        Handler.__init__(self, transport)
+        super(ApiHandler, self).__init__(transport)
         self._api = Api(self._transport, auth)
         self._handler = handler_class(self._api, *handler_args,
                                       **handler_kwargs)
diff --git a/devicehive/api_request.py b/devicehive/api_request.py
index 9b7947e..a0204b0 100644
--- a/devicehive/api_request.py
+++ b/devicehive/api_request.py
@@ -97,13 +97,13 @@ class AuthApiRequest(ApiRequest):
     def execute(self, error_message):
         self.header(*self._api.token.auth_header)
         try:
-            return ApiRequest.execute(self, error_message)
+            return super(AuthApiRequest, self).execute(error_message)
         except ApiResponseError as api_response_error:
             if api_response_error.code != 401:
                 raise
         self._api.token.auth()
         self.header(*self._api.token.auth_header)
-        return ApiRequest.execute(self, error_message)
+        return super(AuthApiRequest, self).execute(error_message)
 
 
 class SubscriptionApiRequest(object):
@@ -170,7 +170,7 @@ class AuthSubscriptionApiRequest(SubscriptionApiRequest):
     """Auth subscription api request class."""
 
     def __init__(self, api):
-        SubscriptionApiRequest.__init__(self)
+        super(AuthSubscriptionApiRequest, self).__init__()
         auth_header_name, auth_header_value = api.token.auth_header
         self._params['headers'][auth_header_name] = auth_header_value
         self._params['response_error_handler'] = self.response_error_handler
diff --git a/devicehive/api_response.py b/devicehive/api_response.py
index 3cc3943..7a61231 100644
--- a/devicehive/api_response.py
+++ b/devicehive/api_response.py
@@ -54,7 +54,7 @@ def __init__(self, message, transport_name, code, error):
         message = '%s Transport: %s. Code: %s. Error: %s' % (message,
                                                              transport_name,
                                                              code, error)
-        Exception.__init__(self, message)
+        super(ApiResponseError, self).__init__(message)
         self._transport_name = transport_name
         self._code = code
         self._error = error
diff --git a/devicehive/data_formats/json_data_format.py b/devicehive/data_formats/json_data_format.py
index 815116a..98b0dcd 100644
--- a/devicehive/data_formats/json_data_format.py
+++ b/devicehive/data_formats/json_data_format.py
@@ -6,7 +6,7 @@ class JsonDataFormat(DataFormat):
     """Json data format class."""
 
     def __init__(self):
-        DataFormat.__init__(self, 'json', self.TEXT_DATA_TYPE)
+        super(JsonDataFormat, self).__init__('json', self.TEXT_DATA_TYPE)
 
     def encode(self, data):
         return json.dumps(data)
diff --git a/devicehive/transports/http_transport.py b/devicehive/transports/http_transport.py
index 870a2ec..39beb80 100644
--- a/devicehive/transports/http_transport.py
+++ b/devicehive/transports/http_transport.py
@@ -11,8 +11,10 @@ class HttpTransport(Transport):
 
     def __init__(self, data_format_class, data_format_options, handler_class,
                  handler_options):
-        Transport.__init__(self, 'http', HttpTransportError, data_format_class,
-                           data_format_options, handler_class, handler_options)
+        super(HttpTransport, self).__init__('http', HttpTransportError,
+                                            data_format_class,
+                                            data_format_options, handler_class,
+                                            handler_options)
         self._url = None
         self._options = None
         self._events_queue_timeout = None
diff --git a/devicehive/transports/websocket_transport.py b/devicehive/transports/websocket_transport.py
index 07cb1f3..175b72e 100644
--- a/devicehive/transports/websocket_transport.py
+++ b/devicehive/transports/websocket_transport.py
@@ -11,9 +11,11 @@ class WebsocketTransport(Transport):
 
     def __init__(self, data_format_class, data_format_options, handler_class,
                  handler_options):
-        Transport.__init__(self, 'websocket', WebsocketTransportError,
-                           data_format_class, data_format_options,
-                           handler_class, handler_options)
+        super(WebsocketTransport, self).__init__('websocket',
+                                                 WebsocketTransportError,
+                                                 data_format_class,
+                                                 data_format_options,
+                                                 handler_class, handler_options)
         self._websocket = websocket.WebSocket()
         self._pong_received = False
         self._event_queue = []
diff --git a/examples/echo.py b/examples/echo.py
index 08d7a44..a2cd6ea 100644
--- a/examples/echo.py
+++ b/examples/echo.py
@@ -5,7 +5,7 @@
 class EchoHandler(Handler):
 
     def __init__(self, api, device_id='example-echo-device'):
-        Handler.__init__(self, api)
+        super(EchoHandler, self).__init__(api)
         self._device_id = device_id
         self._device = None
 
diff --git a/examples/raspi_led_thermo.py b/examples/raspi_led_thermo.py
index 1e07ab4..71a13e6 100644
--- a/examples/raspi_led_thermo.py
+++ b/examples/raspi_led_thermo.py
@@ -65,7 +65,7 @@ class SampleHandler(Handler):
     INTERVAL_SECONDS = 5
 
     def __init__(self, api, device_id=DEVICE_ID):
-        Handler.__init__(self, api)
+        super(SampleHandler, self).__init__(api)
         self._device_id = device_id
         self._device = None
         self._sensor = TempSensor()
diff --git a/tests/test.py b/tests/test.py
index a02246c..e62f3ea 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -9,7 +9,7 @@ class TestHandler(Handler):
 
     def __init__(self, api, handle_connect, handle_command_insert,
                  handle_command_update, handle_notification):
-        Handler.__init__(self, api)
+        super(TestHandler, self).__init__(api)
         self._handle_connect = handle_connect
         self._handle_command_insert = handle_command_insert
         self._handle_command_update = handle_command_update