diff --git a/openlp/core/lib/eventreceiver.py b/openlp/core/lib/eventreceiver.py
index d21e3f167..76b19957c 100644
--- a/openlp/core/lib/eventreceiver.py
+++ b/openlp/core/lib/eventreceiver.py
@@ -230,7 +230,7 @@ class EventReceiver(QtCore.QObject):
         self.emit(QtCore.SIGNAL(event), msg)
 
 
-class Receiver():
+class Receiver(object):
     """
     Class to allow events to be passed from different parts of the system. This
     is a static wrapper around the ``EventReceiver`` class. As there is only
diff --git a/openlp/migration/display.py b/openlp/migration/display.py
index 8553f432a..abe991075 100644
--- a/openlp/migration/display.py
+++ b/openlp/migration/display.py
@@ -27,7 +27,7 @@ import logging
 
 log = logging.getLogger(__name__)
 
-class Display():
+class Display(object):
     log.info(u'Display Class loaded')
 
     @staticmethod
diff --git a/openlp/migration/migratebibles.py b/openlp/migration/migratebibles.py
index 168511a02..17ded3a80 100644
--- a/openlp/migration/migratebibles.py
+++ b/openlp/migration/migratebibles.py
@@ -27,7 +27,6 @@ import os
 import sys
 import sqlite3
 
-from sqlalchemy import *
 from sqlalchemy import create_engine
 from sqlalchemy.orm import scoped_session, sessionmaker, mapper
 
@@ -93,7 +92,7 @@ def init_models(url):
         autocommit=False, bind=engine))
     return session
 
-class MigrateBibles():
+class MigrateBibles(object):
     def __init__(self, display):
         self.display = display
         self.data_path = AppLocation.get_section_data_path(u'bibles')
diff --git a/openlp/migration/migratefiles.py b/openlp/migration/migratefiles.py
index ceca99718..91fff144d 100644
--- a/openlp/migration/migratefiles.py
+++ b/openlp/migration/migratefiles.py
@@ -25,7 +25,7 @@
 
 from openlp.core.utils import AppLocation
 
-class MigrateFiles():
+class MigrateFiles(object):
     def __init__(self, display):
         self.display = display
 
diff --git a/openlp/migration/migratesongs.py b/openlp/migration/migratesongs.py
index 19b77adae..f7624e98c 100644
--- a/openlp/migration/migratesongs.py
+++ b/openlp/migration/migratesongs.py
@@ -94,7 +94,7 @@ class TSongAuthor(BaseModel):
     """
     pass
 
-class MigrateSongs():
+class MigrateSongs(object):
     def __init__(self, display):
         self.display = display
         self.data_path = AppLocation.get_section_data_path(u'songs')
diff --git a/openlp/plugins/alerts/lib/manager.py b/openlp/plugins/alerts/lib/manager.py
index f82266f49..9d9c87fbb 100644
--- a/openlp/plugins/alerts/lib/manager.py
+++ b/openlp/plugins/alerts/lib/manager.py
@@ -32,7 +32,7 @@ from openlp.plugins.alerts.lib.models import init_models, metadata, AlertItem
 
 log = logging.getLogger(__name__)
 
-class DBManager():
+class DBManager(object):
     """
     The Song Manager provides a central location for all database code. This
     class takes care of connecting to the database and running all the queries.
@@ -70,13 +70,13 @@ class DBManager():
         """
         return self.session.query(AlertItem).order_by(AlertItem.text).all()
 
-    def save_alert(self, AlertItem):
+    def save_alert(self, alert_item):
         """
         Saves a Alert show to the database
         """
         log.debug(u'Alert added')
         try:
-            self.session.add(AlertItem)
+            self.session.add(alert_item)
             self.session.commit()
             log.debug(u'Alert saved')
             return True
@@ -99,9 +99,9 @@ class DBManager():
         Delete a Alert show
         """
         if id != 0:
-            AlertItem = self.get_alert(id)
+            alert_item = self.get_alert(id)
             try:
-                self.session.delete(AlertItem)
+                self.session.delete(alert_item)
                 self.session.commit()
                 return True
             except:
@@ -110,3 +110,4 @@ class DBManager():
                 return False
         else:
             return True
+
diff --git a/openlp/plugins/custom/lib/manager.py b/openlp/plugins/custom/lib/manager.py
index 9e781f560..b5e0e8411 100644
--- a/openlp/plugins/custom/lib/manager.py
+++ b/openlp/plugins/custom/lib/manager.py
@@ -32,7 +32,7 @@ from openlp.plugins.custom.lib.models import init_models, metadata, CustomSlide
 
 log = logging.getLogger(__name__)
 
-class CustomManager():
+class CustomManager(object):
     """
     The Song Manager provides a central location for all database code. This
     class takes care of connecting to the database and running all the queries.
diff --git a/openlp/plugins/songusage/lib/manager.py b/openlp/plugins/songusage/lib/manager.py
index e8816b552..cb8ea91bf 100644
--- a/openlp/plugins/songusage/lib/manager.py
+++ b/openlp/plugins/songusage/lib/manager.py
@@ -33,7 +33,7 @@ from openlp.plugins.songusage.lib.models import init_models, metadata, \
 
 log = logging.getLogger(__name__)
 
-class SongUsageManager():
+class SongUsageManager(object):
     """
     The Song Manager provides a central location for all database code. This
     class takes care of connecting to the database and running all the queries.