diff --git a/django/views/generic/base.py b/django/views/generic/base.py
index 5e69a8dd30..7f60ff0773 100644
--- a/django/views/generic/base.py
+++ b/django/views/generic/base.py
@@ -8,6 +8,7 @@ from django.utils.decorators import classonlymethod
 
 logger = getLogger('django.request')
 
+
 class View(object):
     """
     Intentionally simple parent class for all views. Only implements
diff --git a/django/views/generic/dates.py b/django/views/generic/dates.py
index c9e486b8cf..2dd8883fa0 100644
--- a/django/views/generic/dates.py
+++ b/django/views/generic/dates.py
@@ -212,8 +212,6 @@ class BaseDateListView(MultipleObjectMixin, DateMixin, View):
 
         return date_list
 
-
-
     def get_context_data(self, **kwargs):
         """
         Get the context. Must return a Context (or subclass) instance.
@@ -240,7 +238,7 @@ class BaseArchiveIndexView(BaseDateListView):
         date_list = self.get_date_list(qs, 'year')
 
         if date_list:
-            object_list = qs.order_by('-'+self.get_date_field())
+            object_list = qs.order_by('-' + self.get_date_field())
         else:
             object_list = qs.none()
 
@@ -327,7 +325,6 @@ class BaseMonthArchiveView(YearMixin, MonthMixin, BaseDateListView):
         })
 
 
-
 class MonthArchiveView(MultipleObjectTemplateResponseMixin, BaseMonthArchiveView):
     """
     List of objects published in a given year.
@@ -416,7 +413,6 @@ class BaseDayArchiveView(YearMixin, MonthMixin, DayMixin, BaseDateListView):
         })
 
 
-
 class DayArchiveView(MultipleObjectTemplateResponseMixin, BaseDayArchiveView):
     """
     List of objects published on a given day.
@@ -477,7 +473,6 @@ class BaseDateDetailView(YearMixin, MonthMixin, DayMixin, DateMixin, BaseDetailV
         return super(BaseDetailView, self).get_object(queryset=qs)
 
 
-
 class DateDetailView(SingleObjectTemplateResponseMixin, BaseDateDetailView):
     """
     Detail view of a single object on a single date; this differs from the
@@ -498,6 +493,7 @@ def _date_from_string(year, year_format, month, month_format, day='', day_format
     except ValueError:
         raise Http404(u"Invalid date string '%s' given format '%s'" % (datestr, format))
 
+
 def _month_bounds(date):
     """
     Helper: return the first and last days of the month for the given date.
@@ -510,6 +506,7 @@ def _month_bounds(date):
 
     return first_day, last_day
 
+
 def _get_next_prev_month(generic_view, naive_result, is_previous, use_first_day):
     """
     Helper: Get the next or the previous valid date. The idea is to allow
@@ -582,6 +579,7 @@ def _get_next_prev_month(generic_view, naive_result, is_previous, use_first_day)
     else:
         return None
 
+
 def _date_lookup_for_field(field, date):
     """
     Get the lookup kwargs for looking up a date against a given Field. If the
@@ -597,4 +595,3 @@ def _date_lookup_for_field(field, date):
         return {'%s__range' % field.name: date_range}
     else:
         return {field.name: date}
-
diff --git a/django/views/generic/edit.py b/django/views/generic/edit.py
index 931a2d3fe2..33a312709d 100644
--- a/django/views/generic/edit.py
+++ b/django/views/generic/edit.py
@@ -102,9 +102,6 @@ class ModelFormMixin(FormMixin, SingleObjectMixin):
         self.object = form.save()
         return super(ModelFormMixin, self).form_valid(form)
 
-    def form_invalid(self, form):
-        return self.render_to_response(self.get_context_data(form=form))
-
     def get_context_data(self, **kwargs):
         context = kwargs
         if self.object:
@@ -169,6 +166,7 @@ class BaseCreateView(ModelFormMixin, ProcessFormView):
     def put(self, *args, **kwargs):
         return self.post(*args, **kwargs)
 
+
 class CreateView(SingleObjectTemplateResponseMixin, BaseCreateView):
     """
     View for creating an new object instance,
@@ -227,6 +225,7 @@ class DeletionMixin(object):
             raise ImproperlyConfigured(
                 "No URL to redirect to. Provide a success_url.")
 
+
 class BaseDeleteView(DeletionMixin, BaseDetailView):
     """
     Base view for deleting an object.
@@ -234,6 +233,7 @@ class BaseDeleteView(DeletionMixin, BaseDetailView):
     Using this base class requires subclassing to provide a response mixin.
     """
 
+
 class DeleteView(SingleObjectTemplateResponseMixin, BaseDeleteView):
     """
     View for deleting an object retrieved with `self.get_object()`,
diff --git a/django/views/generic/list.py b/django/views/generic/list.py
index 7b817a5f02..9f1c8aab29 100644
--- a/django/views/generic/list.py
+++ b/django/views/generic/list.py
@@ -119,6 +119,7 @@ class BaseListView(MultipleObjectMixin, View):
         context = self.get_context_data(object_list=self.object_list)
         return self.render_to_response(context)
 
+
 class MultipleObjectTemplateResponseMixin(TemplateResponseMixin):
     template_name_suffix = '_list'
 
@@ -139,6 +140,7 @@ class MultipleObjectTemplateResponseMixin(TemplateResponseMixin):
 
         return names
 
+
 class ListView(MultipleObjectTemplateResponseMixin, BaseListView):
     """
     Render some list of objects, set by `self.model` or `self.queryset`.