Cleaning up pep8 violations

common/djangoapps/cache_toolbox/core.py

@@ -13,6 +13,7 @@ from django.db import DEFAULT_DB_ALIAS
 
 from . import app_settings
 
+
 def get_instance(model, instance_or_pk, timeout=None, using=None):
     """
     Returns the ``model`` instance with a primary key of ``instance_or_pk``.
@@ -87,6 +88,7 @@ def get_instance(model, instance_or_pk, timeout=None, using=None):
 
     return instance
 
+
 def delete_instance(model, *instance_or_pk):
     """
     Purges the cache keys for the instances of this model.
@@ -94,6 +96,7 @@ def delete_instance(model, *instance_or_pk):
 
     cache.delete_many([instance_key(model, x) for x in instance_or_pk])
 
+
 def instance_key(model, instance_or_pk):
     """
     Returns the cache key for this (model, instance) pair.

common/djangoapps/cache_toolbox/middleware.py

@@ -84,6 +84,7 @@ from django.contrib.auth.middleware import AuthenticationMiddleware
 
 from .model import cache_model
 
+
 class CacheBackedAuthenticationMiddleware(AuthenticationMiddleware):
     def __init__(self):
         cache_model(User)

common/djangoapps/cache_toolbox/model.py

@@ -58,6 +58,7 @@ from django.db.models.signals import post_save, post_delete
 
 from .core import get_instance, delete_instance
 
+
 def cache_model(model, timeout=None):
     if hasattr(model, 'get_cached'):
         # Already patched

common/djangoapps/cache_toolbox/relation.py

@@ -74,6 +74,7 @@ from django.db.models.signals import post_save, post_delete
 
 from .core import get_instance, delete_instance
 
+
 def cache_relation(descriptor, timeout=None):
     rel = descriptor.related
     related_name = '%s_cache' % rel.field.related_query_name()

common/djangoapps/cache_toolbox/templatetags/cache_toolbox.py

@@ -5,6 +5,7 @@ from django.template import resolve_variable
 
 register = template.Library()
 
+
 class CacheNode(Node):
     def __init__(self, nodelist, expire_time, key):
         self.nodelist = nodelist
@@ -21,6 +22,7 @@ class CacheNode(Node):
             cache.set(key, value, expire_time)
         return value
 
+
 @register.tag
 def cachedeterministic(parser, token):
     """
@@ -42,6 +44,7 @@ def cachedeterministic(parser, token):
         raise TemplateSyntaxError(u"'%r' tag requires 2 arguments." % tokens[0])
     return CacheNode(nodelist, tokens[1], tokens[2])
 
+
 class ShowIfCachedNode(Node):
     def __init__(self, key):
         self.key = key
@@ -50,6 +53,7 @@ class ShowIfCachedNode(Node):
         key = resolve_variable(self.key, context)
         return cache.get(key) or ''
 
+
 @register.tag
 def showifcached(parser, token):
     """