diff --git a/rhodecode/lib/dbmigrate/__init__.py b/rhodecode/lib/dbmigrate/__init__.py
--- a/rhodecode/lib/dbmigrate/__init__.py
+++ b/rhodecode/lib/dbmigrate/__init__.py
@@ -32,6 +32,7 @@ from rhodecode.lib.db_manage import DbMa
 
 log = logging.getLogger(__name__)
 
+
 class UpgradeDb(BasePasterCommand):
     """Command used for paster to upgrade our database to newer version
     """
@@ -57,8 +58,6 @@ class UpgradeDb(BasePasterCommand):
 
         dbmanage.upgrade()
 
-
-
     def update_parser(self):
         self.parser.add_option('--sql',
                       action='store_true',
diff --git a/rhodecode/lib/dbmigrate/migrate/changeset/__init__.py b/rhodecode/lib/dbmigrate/migrate/changeset/__init__.py
--- a/rhodecode/lib/dbmigrate/migrate/changeset/__init__.py
+++ b/rhodecode/lib/dbmigrate/migrate/changeset/__init__.py
@@ -12,7 +12,8 @@ from sqlalchemy import __version__ as _s
 
 warnings.simplefilter('always', DeprecationWarning)
 
-_sa_version = tuple(int(re.match("\d+", x).group(0)) for x in _sa_version.split("."))
+_sa_version = tuple(int(re.match("\d+", x).group(0))
+                    for x in _sa_version.split("."))
 SQLA_06 = _sa_version >= (0, 6)
 
 del re
@@ -21,8 +22,8 @@ del _sa_version
 from rhodecode.lib.dbmigrate.migrate.changeset.schema import *
 from rhodecode.lib.dbmigrate.migrate.changeset.constraint import *
 
-sqlalchemy.schema.Table.__bases__ += (ChangesetTable, )
-sqlalchemy.schema.Column.__bases__ += (ChangesetColumn, )
-sqlalchemy.schema.Index.__bases__ += (ChangesetIndex, )
+sqlalchemy.schema.Table.__bases__ += (ChangesetTable,)
+sqlalchemy.schema.Column.__bases__ += (ChangesetColumn,)
+sqlalchemy.schema.Index.__bases__ += (ChangesetIndex,)
 
-sqlalchemy.schema.DefaultClause.__bases__ += (ChangesetDefaultClause, )
+sqlalchemy.schema.DefaultClause.__bases__ += (ChangesetDefaultClause,)
diff --git a/rhodecode/lib/dbmigrate/migrate/exceptions.py b/rhodecode/lib/dbmigrate/migrate/exceptions.py
--- a/rhodecode/lib/dbmigrate/migrate/exceptions.py
+++ b/rhodecode/lib/dbmigrate/migrate/exceptions.py
@@ -71,11 +71,6 @@ class InvalidScriptError(ScriptError):
     """Invalid script error."""
 
 
-class InvalidVersionError(Error):
-    """Invalid version error."""
-
-# migrate.changeset
-
 class NotSupportedError(Error):
     """Not supported error"""
 
@@ -83,5 +78,6 @@ class NotSupportedError(Error):
 class InvalidConstraintError(Error):
     """Invalid constraint error"""
 
+
 class MigrateDeprecationWarning(DeprecationWarning):
     """Warning for deprecated features in Migrate"""