PEP8 cleanups, style cleanups, unused imports

apps/lock_manager/managers.py

@@ -3,7 +3,6 @@ from __future__ import absolute_import
 import logging
 import datetime
 
-from django.db.utils import DatabaseError
 from django.db.utils import IntegrityError
 from django.db import transaction
 from django.db import models

apps/lock_manager/models.py

@@ -21,7 +21,7 @@ class Lock(models.Model):
 
     def save(self, *args, **kwargs):
         self.creation_datetime = datetime.datetime.now()
-        if not self.timeout and not kwarget.get('timeout'):
+        if not self.timeout and not kwargs.get('timeout'):
             self.timeout = DEFAULT_LOCK_TIMEOUT
 
         super(Lock, self).save(*args, **kwargs)