Fix PEP8 whitespace issues

autopep8 -r polymorphic/ example/ -i
--select=E112,E113,E115,E116,E122,E123,E125,E127,E128,E201,E202,E203,E211,E225,E226,E227,E228,E231,E251,E261,E262,E271,E272,E273,E274,E301,E302,E303,E304,E309,E711,E713,W291,W293,W391
--exclude migrations,south_migrations

(line conditiation fixes: E123,E125,E122,E127,E128)

example/example/settings.py

@@ -75,7 +75,7 @@ INSTALLED_APPS = (
     'pexp',             # this Django app is for testing and experimentation; not needed otherwise
 )
 
-if django.VERSION >= (1,7):
+if django.VERSION >= (1, 7):
     TEST_RUNNER = 'django.test.runner.DiscoverRunner'  # silence system checks
 
 # Logging configuration

example/pexp/admin.py

@@ -14,6 +14,7 @@ class ProjectChildAdmin(PolymorphicChildModelAdmin):
         }),
     )
 
+
 class ProjectAdmin(PolymorphicParentModelAdmin):
     base_model = Project
     list_filter = (PolymorphicChildModelFilter,)
@@ -26,10 +27,10 @@ class ProjectAdmin(PolymorphicParentModelAdmin):
 admin.site.register(Project, ProjectAdmin)
 
 
-
 class ModelAChildAdmin(PolymorphicChildModelAdmin):
     base_model = ModelA
 
+
 class ModelAAdmin(PolymorphicParentModelAdmin):
     base_model = ModelA
     list_filter = (PolymorphicChildModelFilter,)
@@ -45,6 +46,7 @@ admin.site.register(ModelA, ModelAAdmin)
 class Model2AChildAdmin(PolymorphicChildModelAdmin):
     base_model = Model2A
 
+
 class Model2AAdmin(PolymorphicParentModelAdmin):
     base_model = Model2A
     list_filter = (PolymorphicChildModelFilter,)
@@ -60,6 +62,7 @@ admin.site.register(Model2A, Model2AAdmin)
 class UUIDModelAChildAdmin(PolymorphicChildModelAdmin):
     base_model = UUIDModelA
 
+
 class UUIDModelAAdmin(PolymorphicParentModelAdmin):
     base_model = UUIDModelA
     list_filter = (PolymorphicChildModelFilter,)
@@ -75,6 +78,7 @@ admin.site.register(UUIDModelA, UUIDModelAAdmin)
 class ProxyChildAdmin(PolymorphicChildModelAdmin):
     base_model = ProxyBase
 
+
 class ProxyAdmin(PolymorphicParentModelAdmin):
     base_model = ProxyBase
     list_filter = (PolymorphicChildModelFilter,)

example/pexp/management/commands/p2cmd.py

@@ -8,30 +8,33 @@ import uuid
 from django.core.management.base import NoArgsCommand
 from django.db.models import connection
 from pprint import pprint
-import time,sys
+import time, sys
 
 from pexp.models import *
 
+
 def reset_queries():
-    connection.queries=[]
+    connection.queries = []
+
 
 def show_queries():
-    print; print 'QUERIES:',len(connection.queries); pprint(connection.queries); print; connection.queries=[]
+    print; print 'QUERIES:', len(connection.queries); pprint(connection.queries); print; connection.queries = []
+
 
 def print_timing(func, message='', iterations=1):
     def wrapper(*arg):
-        results=[]
+        results = []
         reset_queries()
         for i in xrange(iterations):
             t1 = time.time()
             x = func(*arg)
             t2 = time.time()
-            results.append((t2-t1)*1000.0)
+            results.append((t2 - t1) * 1000.0)
-        res_sum=0
+        res_sum = 0
-        for r in results: res_sum +=r
+        for r in results: res_sum += r
         median = res_sum / len(results)
         print '%s%-19s: %.4f ms, %i queries (%i times)' % (
-            message,func.func_name,
+            message, func.func_name,
             res_sum,
             len(connection.queries),
             iterations
@@ -39,15 +42,16 @@ def print_timing(func, message='', iterations=1):
         sys.stdout.flush()
     return wrapper
 
+
 class Command(NoArgsCommand):
     help = ""
 
     def handle_noargs(self, **options):
         if False:
             ModelA.objects.all().delete()
-            a=ModelA.objects.create(field1='A1')
+            a = ModelA.objects.create(field1='A1')
-            b=ModelB.objects.create(field1='B1', field2='B2')
+            b = ModelB.objects.create(field1='B1', field2='B2')
-            c=ModelC.objects.create(field1='C1', field2='C2', field3='C3')
+            c = ModelC.objects.create(field1='C1', field2='C2', field3='C3')
             reset_queries()
             print ModelC.base_objects.all();
             show_queries()
@@ -55,29 +59,30 @@ class Command(NoArgsCommand):
         if False:
             ModelA.objects.all().delete()
             for i in xrange(1000):
-                a=ModelA.objects.create(field1=str(i%100))
+                a = ModelA.objects.create(field1=str(i % 100))
-                b=ModelB.objects.create(field1=str(i%100), field2=str(i%200))
+                b = ModelB.objects.create(field1=str(i % 100), field2=str(i % 200))
-                c=ModelC.objects.create(field1=str(i%100), field2=str(i%200), field3=str(i%300))
+                c = ModelC.objects.create(field1=str(i % 100), field2=str(i % 200), field3=str(i % 300))
-                if i%100==0: print i
+                if i % 100 == 0: print i
 
-        f=print_timing(poly_sql_query,iterations=1000)
+        f = print_timing(poly_sql_query, iterations=1000)
         f()
 
-        f=print_timing(poly_sql_query2,iterations=1000)
+        f = print_timing(poly_sql_query2, iterations=1000)
         f()
 
         return
 
         nModelA.objects.all().delete()
-        a=nModelA.objects.create(field1='A1')
+        a = nModelA.objects.create(field1='A1')
-        b=nModelB.objects.create(field1='B1', field2='B2')
+        b = nModelB.objects.create(field1='B1', field2='B2')
-        c=nModelC.objects.create(field1='C1', field2='C2', field3='C3')
+        c = nModelC.objects.create(field1='C1', field2='C2', field3='C3')
-        qs=ModelA.objects.raw("SELECT * from pexp_modela")
+        qs = ModelA.objects.raw("SELECT * from pexp_modela")
         for o in list(qs): print o
 
 from django.db import connection, transaction
 from random import Random
-rnd=Random()
+rnd = Random()
+
 
 def poly_sql_query():
     cursor = connection.cursor()
@@ -90,10 +95,11 @@ def poly_sql_query():
         ON pexp_modelb.modela_ptr_id = pexp_modelc.modelb_ptr_id
         WHERE pexp_modela.field1=%i
         ORDER BY pexp_modela.id
-        """ % rnd.randint(0,100) )
+        """ % rnd.randint(0, 100) )
     #row=cursor.fetchone()
     return
 
+
 def poly_sql_query2():
     cursor = connection.cursor()
     cursor.execute("""
@@ -101,6 +107,6 @@ def poly_sql_query2():
         FROM pexp_modela
         WHERE pexp_modela.field1=%i
         ORDER BY pexp_modela.id
-        """ % rnd.randint(0,100) )
+        """ % rnd.randint(0, 100) )
     #row=cursor.fetchone()
     return

example/pexp/management/commands/pcmd.py

@@ -9,27 +9,29 @@ from pprint import pprint
 
 from pexp.models import *
 
+
 def reset_queries():
-    connection.queries=[]
+    connection.queries = []
+
 
 def show_queries():
-    print; print 'QUERIES:',len(connection.queries); pprint(connection.queries); print; connection.queries=[]
+    print; print 'QUERIES:', len(connection.queries); pprint(connection.queries); print; connection.queries = []
+
 
 class Command(NoArgsCommand):
     help = ""
 
     def handle_noargs(self, **options):
         Project.objects.all().delete()
-        a=Project.objects.create(topic="John's gathering")
+        a = Project.objects.create(topic="John's gathering")
-        b=ArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")
+        b = ArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")
-        c=ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")
+        c = ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")
         print Project.objects.all()
         print
 
         ModelA.objects.all().delete()
-        a=ModelA.objects.create(field1='A1')
+        a = ModelA.objects.create(field1='A1')
-        b=ModelB.objects.create(field1='B1', field2='B2')
+        b = ModelB.objects.create(field1='B1', field2='B2')
-        c=ModelC.objects.create(field1='C1', field2='C2', field3='C3')
+        c = ModelC.objects.create(field1='C1', field2='C2', field3='C3')
         print ModelA.objects.all()
         print
-

example/pexp/management/commands/polybench.py

@@ -9,43 +9,47 @@ from pprint import pprint
 import sys
 from pexp.models import *
 
-num_objects=1000
+num_objects = 1000
+
 
 def reset_queries():
-    connection.queries=[]
+    connection.queries = []
+
 
 def show_queries():
-    print; print 'QUERIES:',len(connection.queries); pprint(connection.queries); print; reset_queries()
+    print; print 'QUERIES:', len(connection.queries); pprint(connection.queries); print; reset_queries()
 
 import time
 
 ###################################################################################
 ### benchmark wrappers
 
+
 def print_timing(func, message='', iterations=1):
     def wrapper(*arg):
-        results=[]
+        results = []
         reset_queries()
         for i in xrange(iterations):
             t1 = time.time()
             x = func(*arg)
             t2 = time.time()
-            results.append((t2-t1)*1000.0)
+            results.append((t2 - t1) * 1000.0)
-        res_sum=0
+        res_sum = 0
-        for r in results: res_sum +=r
+        for r in results: res_sum += r
         median = res_sum / len(results)
         print '%s%-19s: %.0f ms, %i queries' % (
-            message,func.func_name,
+            message, func.func_name,
             median,
-            len(connection.queries)/len(results)
+            len(connection.queries) / len(results)
         )
         sys.stdout.flush()
     return wrapper
 
+
 def run_vanilla_any_poly(func, iterations=1):
-    f=print_timing(func,'     ', iterations)
+    f = print_timing(func, '     ', iterations)
     f(nModelC)
-    f=print_timing(func,'poly ', iterations)
+    f = print_timing(func, 'poly ', iterations)
     f(ModelC)
 
 
@@ -54,30 +58,35 @@ def run_vanilla_any_poly(func, iterations=1):
 
 def bench_create(model):
     for i in xrange(num_objects):
-        model.objects.create(field1='abc'+str(i), field2='abcd'+str(i), field3='abcde'+str(i))
+        model.objects.create(field1='abc' + str(i), field2='abcd' + str(i), field3='abcde' + str(i))
     #print 'count:',model.objects.count()
 
+
 def bench_load1(model):
     for o in model.objects.all():
         pass
 
+
 def bench_load1_short(model):
-    for i in xrange(num_objects/100):
+    for i in xrange(num_objects / 100):
         for o in model.objects.all()[:100]:
             pass
 
+
 def bench_load2(model):
     for o in model.objects.all():
-        f1=o.field1
+        f1 = o.field1
-        f2=o.field2
+        f2 = o.field2
-        f3=o.field3
+        f3 = o.field3
+
 
 def bench_load2_short(model):
-    for i in xrange(num_objects/100):
+    for i in xrange(num_objects / 100):
         for o in model.objects.all()[:100]:
-            f1=o.field1
+            f1 = o.field1
-            f2=o.field2
+            f2 = o.field2
-            f3=o.field3
+            f3 = o.field3
+
 
 def bench_delete(model):
     model.objects.all().delete()
@@ -85,19 +94,20 @@ def bench_delete(model):
 ###################################################################################
 ### Command
 
+
 class Command(NoArgsCommand):
     help = ""
 
     def handle_noargs(self, **options):
         func_list = [
-            ( bench_delete, 1 ),
+            (bench_delete, 1),
-            ( bench_create, 1 ),
+            (bench_create, 1),
-            ( bench_load1,  5 ),
+            (bench_load1,  5),
-            ( bench_load1_short, 5 ),
+            (bench_load1_short, 5),
-            ( bench_load2, 5 ),
+            (bench_load2, 5),
-            ( bench_load2_short, 5 )
+            (bench_load2_short, 5)
         ]
-        for f,iterations in func_list:
+        for f, iterations in func_list:
-            run_vanilla_any_poly(f,iterations=iterations)
+            run_vanilla_any_poly(f, iterations=iterations)
 
         print

example/pexp/management/commands/polymorphic_create_test_data.py

@@ -9,22 +9,22 @@ from pprint import pprint
 
 from pexp.models import *
 
+
 def reset_queries():
-    connection.queries=[]
+    connection.queries = []
+
 
 def show_queries():
-    print; print 'QUERIES:',len(connection.queries); pprint(connection.queries); print; connection.queries=[]
+    print; print 'QUERIES:', len(connection.queries); pprint(connection.queries); print; connection.queries = []
+
 
 class Command(NoArgsCommand):
     help = ""
 
     def handle_noargs(self, **options):
         Project.objects.all().delete()
-        o=Project.objects.create(topic="John's gathering")
+        o = Project.objects.create(topic="John's gathering")
-        o=ArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")
+        o = ArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")
-        o=ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")
+        o = ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")
         print Project.objects.all()
         print
-        
-
-

example/pexp/models.py

@@ -6,48 +6,74 @@ from django.db import models
 from polymorphic.models import PolymorphicModel
 from polymorphic.showfields import ShowFieldContent, ShowFieldType, ShowFieldTypeAndContent
 
+
 class Project(ShowFieldContent, PolymorphicModel):
     topic = models.CharField(max_length=30)
+
+
 class ArtProject(Project):
     artist = models.CharField(max_length=30)
+
+
 class ResearchProject(Project):
     supervisor = models.CharField(max_length=30)
 
+
 class ModelA(ShowFieldTypeAndContent, PolymorphicModel):
     field1 = models.CharField(max_length=10)
+
+
 class ModelB(ModelA):
     field2 = models.CharField(max_length=10)
+
+
 class ModelC(ModelB):
     field3 = models.CharField(max_length=10)
     field4 = models.ManyToManyField(ModelB, related_name='related_c')
 
+
 class nModelA(models.Model):
     field1 = models.CharField(max_length=10)
+
+
 class nModelB(nModelA):
     field2 = models.CharField(max_length=10)
+
+
 class nModelC(nModelB):
     field3 = models.CharField(max_length=10)
 
+
 class Model2A(PolymorphicModel):
     field1 = models.CharField(max_length=10)
+
+
 class Model2B(Model2A):
     field2 = models.CharField(max_length=10)
+
+
 class Model2C(Model2B):
     field3 = models.CharField(max_length=10)
 
-if django.VERSION < (1,8):
+if django.VERSION < (1, 8):
     from polymorphic.tools_for_tests import UUIDField
 else:
     from django.db.models import UUIDField
 
+
 class UUIDModelA(ShowFieldTypeAndContent, PolymorphicModel):
-    uuid_primary_key = UUIDField(primary_key = True)
+    uuid_primary_key = UUIDField(primary_key=True)
     field1 = models.CharField(max_length=10)
+
+
 class UUIDModelB(UUIDModelA):
     field2 = models.CharField(max_length=10)
+
+
 class UUIDModelC(UUIDModelB):
     field3 = models.CharField(max_length=10)
 
+
 class ProxyBase(PolymorphicModel):
     title = models.CharField(max_length=200)
 
@@ -57,14 +83,18 @@ class ProxyBase(PolymorphicModel):
     class Meta:
         ordering = ('title',)
 
+
 class ProxyA(ProxyBase):
+
     class Meta:
         proxy = True
 
     def __unicode__(self):
         return u"<ProxyA: {0}>".format(self.title)
 
+
 class ProxyB(ProxyBase):
+
     class Meta:
         proxy = True
 

polymorphic/__init__.py

@@ -29,9 +29,9 @@ if django.VERSION[:2] < (1, 5):
             ct = self._get_from_cache(opts)
         except KeyError:
             ct, created = self.get_or_create(
-                app_label = opts.app_label,
+                app_label=opts.app_label,
-                model = opts.object_name.lower(),
+                model=opts.object_name.lower(),
-                defaults = {'name': smart_text(opts.verbose_name_raw)},
+                defaults={'name': smart_text(opts.verbose_name_raw)},
             )
             self._add_to_cache(self.db, ct)
 
@@ -39,4 +39,3 @@ if django.VERSION[:2] < (1, 5):
 
     ContentTypeManager.get_for_model__original = ContentTypeManager.get_for_model
     ContentTypeManager.get_for_model = get_for_model
-

polymorphic/admin.py

@@ -42,6 +42,7 @@ class RegistrationClosed(RuntimeError):
     "The admin model can't be registered anymore at this point."
     pass
 
+
 class ChildAdminNotRegistered(RuntimeError):
     "The admin site for the model is not registered."
     pass
@@ -122,13 +123,11 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
     #: If your primary key consists of string values, update this regular expression.
     pk_regex = '(\d+|__fk__)'
 
-
     def __init__(self, model, admin_site, *args, **kwargs):
         super(PolymorphicParentModelAdmin, self).__init__(model, admin_site, *args, **kwargs)
         self._child_admin_site = self.admin_site.__class__(name=self.admin_site.name)
         self._is_setup = False
 
-
     def _lazy_setup(self):
         if self._is_setup:
             return
@@ -150,7 +149,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
         self._child_admin_site._registry = complete_registry
         self._is_setup = True
 
-
     def register_child(self, model, model_admin):
         """
         Register a model with admin to display.
@@ -167,7 +165,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
         self._child_admin_site.register(model, model_admin)
 
-
     def get_child_models(self):
         """
         Return the derived model classes which this admin should handle.
@@ -181,7 +178,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
         return self.child_models
 
-
     def get_child_type_choices(self, request, action):
         """
         Return a list of polymorphic types for which the user has the permission to perform the given action.
@@ -197,7 +193,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             choices.append((ct.id, model._meta.verbose_name))
         return choices
 
-
     def _get_real_admin(self, object_id):
         try:
             obj = self.model.objects.non_polymorphic() \
@@ -206,7 +201,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             raise Http404
         return self._get_real_admin_by_ct(obj['polymorphic_ctype'])
 
-
     def _get_real_admin_by_ct(self, ct_id):
         try:
             ct = ContentType.objects.get_for_id(ct_id)
@@ -219,7 +213,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
         return self._get_real_admin_by_model(model_class)
 
-
     def _get_real_admin_by_model(self, model_class):
         # In case of a ?ct_id=### parameter, the view is already checked for permissions.
         # Hence, make sure this is a derived object, or risk exposing other admin interfaces.
@@ -233,7 +226,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
         except KeyError:
             raise ChildAdminNotRegistered("No child admin site was registered for a '{0}' model.".format(model_class))
 
-
     def get_queryset(self, request):
         # optimize the list display.
         qs = super(PolymorphicParentModelAdmin, self).get_queryset(request)
@@ -241,7 +233,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             qs = qs.non_polymorphic()
         return qs
 
-
     # For Django 1.5:
     def queryset(self, request):
         qs = super(PolymorphicParentModelAdmin, self).queryset(request)
@@ -249,7 +240,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             qs = qs.non_polymorphic()
         return qs
 
-
     def add_view(self, request, form_url='', extra_context=None):
         """Redirect the add view to the real admin."""
         ct_id = int(request.GET.get('ct_id', 0))
@@ -266,13 +256,11 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             )
             return real_admin.add_view(request, form_url, extra_context)
 
-
     def change_view(self, request, object_id, *args, **kwargs):
         """Redirect the change view to the real admin."""
         real_admin = self._get_real_admin(object_id)
         return real_admin.change_view(request, object_id, *args, **kwargs)
 
-
     def delete_view(self, request, object_id, extra_context=None):
         """Redirect the delete view to the real admin."""
         real_admin = self._get_real_admin(object_id)
@@ -331,7 +319,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
         return urls + custom_urls + dummy_urls
 
-
     def subclass_view(self, request, path):
         """
         Forward any request to a custom view of the real admin.
@@ -350,7 +337,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
             ct_id = self.model.objects.values_list('polymorphic_ctype_id', flat=True).get(pk=object_id)
 
-
         real_admin = self._get_real_admin_by_ct(ct_id)
         resolver = RegexURLResolver('^', real_admin.urls)
         resolvermatch = resolver.resolve(path)  # May raise Resolver404
@@ -359,7 +345,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
 
         return resolvermatch.func(request, *resolvermatch.args, **resolvermatch.kwargs)
 
-
     def add_type_view(self, request, form_url=''):
         """
         Display a choice form to select which page type to add.
@@ -402,7 +387,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
         }
         return self.render_add_type_form(request, context, form_url)
 
-
     def render_add_type_form(self, request, context, form_url=''):
         """
         Render the page type choice form.
@@ -426,7 +410,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             "admin/add_type_form.html"
         ], context, context_instance=context_instance)
 
-
     @property
     def change_list_template(self):
         opts = self.model._meta
@@ -446,7 +429,6 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
         ]
 
 
-
 class PolymorphicChildModelAdmin(admin.ModelAdmin):
     """
     The *optional* base class for the admin interface of derived models.
@@ -465,7 +447,6 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
     base_fieldsets = None
     extra_fieldset_title = _("Contents")  # Default title for extra fieldset
 
-
     def get_form(self, request, obj=None, **kwargs):
         # The django admin validation requires the form to have a 'class Meta: model = ..'
         # attribute, or it will complain that the fields are missing.
@@ -482,7 +463,6 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
 
         return super(PolymorphicChildModelAdmin, self).get_form(request, obj, **kwargs)
 
-
     @property
     def change_form_template(self):
         opts = self.model._meta
@@ -502,7 +482,6 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
             "admin/change_form.html"
         ]
 
-
     @property
     def delete_confirmation_template(self):
         opts = self.model._meta
@@ -522,21 +501,18 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
             "admin/delete_confirmation.html"
         ]
 
-
     def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
         context.update({
             'base_opts': self.base_model._meta,
         })
         return super(PolymorphicChildModelAdmin, self).render_change_form(request, context, add=add, change=change, form_url=form_url, obj=obj)
 
-
     def delete_view(self, request, object_id, context=None):
         extra_context = {
             'base_opts': self.base_model._meta,
         }
         return super(PolymorphicChildModelAdmin, self).delete_view(request, object_id, extra_context)
 
-
     # ---- Extra: improving the form/fieldset default display ----
 
     def get_fieldsets(self, request, obj=None):
@@ -557,7 +533,6 @@ class PolymorphicChildModelAdmin(admin.ModelAdmin):
         else:
             return self.base_fieldsets
 
-
     def get_subclass_fields(self, request, obj=None):
         # Find out how many fields would really be on the form,
         # if it weren't restricted by declared fields.

polymorphic/base.py

@@ -57,7 +57,7 @@ class PolymorphicModelBase(ModelBase):
 
         # Workaround compatibility issue with six.with_metaclass() and custom Django model metaclasses:
         if not attrs and model_name == 'NewBase':
-            if django.VERSION < (1,5):
+            if django.VERSION < (1, 5):
                 # Let Django fully ignore the class which is inserted in between.
                 # Django 1.5 fixed this, see https://code.djangoproject.com/ticket/19688
                 attrs['__module__'] = 'django.utils.six'

polymorphic/models.py

@@ -26,6 +26,7 @@ from .query_translate import translate_polymorphic_Q_object
 ###################################################################################
 ### PolymorphicModel
 
+
 class PolymorphicModel(six.with_metaclass(PolymorphicModelBase, models.Model)):
     """
     Abstract base class that provides polymorphic behaviour
@@ -203,15 +204,15 @@ class PolymorphicModel(six.with_metaclass(PolymorphicModelBase, models.Model)):
 
         def add_all_super_models(model, result):
             for super_cls, field_to_super in model._meta.parents.items():
-                if field_to_super is not None:  #if not a link to a proxy model
+                if field_to_super is not None:  # if not a link to a proxy model
-                    field_name = field_to_super.name #the field on model can have a different name to super_cls._meta.module_name, if the field is created manually using 'parent_link'
+                    field_name = field_to_super.name  # the field on model can have a different name to super_cls._meta.module_name, if the field is created manually using 'parent_link'
                     add_model_if_regular(super_cls, field_name, result)
                     add_all_super_models(super_cls, result)
 
         def add_all_sub_models(super_cls, result):
-            for sub_cls in super_cls.__subclasses__(): #go through all subclasses of model  
+            for sub_cls in super_cls.__subclasses__():  # go through all subclasses of model
-                if super_cls in sub_cls._meta.parents: #super_cls may not be in sub_cls._meta.parents if super_cls is a proxy model
+                if super_cls in sub_cls._meta.parents:  # super_cls may not be in sub_cls._meta.parents if super_cls is a proxy model
-                    field_to_super = sub_cls._meta.parents[super_cls] #get the field that links sub_cls to super_cls    
+                    field_to_super = sub_cls._meta.parents[super_cls]  # get the field that links sub_cls to super_cls
                     if field_to_super is not None:    # if filed_to_super is not a link to a proxy model
                         super_to_sub_related_field = field_to_super.rel
                         if super_to_sub_related_field.related_name is None:

polymorphic/query.py

@@ -35,7 +35,7 @@ def transmogrify(cls, obj):
     else:
         # Run constructor, reassign values
         new = cls()
-        for k,v in obj.__dict__.items():
+        for k, v in obj.__dict__.items():
             new.__dict__[k] = v
     return new
 
@@ -72,7 +72,7 @@ class PolymorphicQuerySet(QuerySet):
         new.polymorphic_disabled = self.polymorphic_disabled
         return new
 
-    if django.VERSION >= (1,7):
+    if django.VERSION >= (1, 7):
         def as_manager(cls):
             # Make sure the Django 1.7 way of creating managers works.
             from .manager import PolymorphicManager
@@ -338,6 +338,7 @@ class PolymorphicQuerySet(QuerySet):
             return super(PolymorphicQuerySet, self).__repr__(*args, **kwargs)
 
     class _p_list_class(list):
+
         def __repr__(self, *args, **kwargs):
             result = [repr(o) for o in self]
             return '[ ' + ',\n  '.join(result) + ' ]'

polymorphic/showfields.py

@@ -3,6 +3,7 @@
 from django.db import models
 from django.utils import six
 
+
 class ShowFieldBase(object):
     """ base class for the ShowField... model mixins, does the work """
 

polymorphic/templatetags/polymorphic_admin_tags.py

@@ -5,6 +5,7 @@ register = Library()
 
 
 class BreadcrumbScope(Node):
+
     def __init__(self, base_opts, nodelist):
         self.base_opts = base_opts
         self.nodelist = nodelist   # Note, takes advantage of Node.child_nodelists
@@ -25,7 +26,6 @@ class BreadcrumbScope(Node):
         else:
             raise TemplateSyntaxError("{0} tag expects 1 argument".format(token.contents[0]))
 
-
     def render(self, context):
         # app_label is really hard to overwrite in the standard Django ModelAdmin.
         # To insert it in the template, the entire render_change_form() and delete_view() have to copied and adjusted.

polymorphic/tests.py

@@ -14,7 +14,7 @@ except ImportError:
 from django.db.models.query import QuerySet
 
 from django.test import TestCase
-from django.db.models import Q,Count
+from django.db.models import Q, Count
 from django.db import models
 from django.contrib.contenttypes.models import ContentType
 from django.utils import six
@@ -32,85 +32,133 @@ except ImportError:
 
 class PlainA(models.Model):
     field1 = models.CharField(max_length=10)
+
+
 class PlainB(PlainA):
     field2 = models.CharField(max_length=10)
+
+
 class PlainC(PlainB):
     field3 = models.CharField(max_length=10)
 
+
 class Model2A(ShowFieldType, PolymorphicModel):
     field1 = models.CharField(max_length=10)
+
+
 class Model2B(Model2A):
     field2 = models.CharField(max_length=10)
+
+
 class Model2C(Model2B):
     field3 = models.CharField(max_length=10)
+
+
 class Model2D(Model2C):
     field4 = models.CharField(max_length=10)
 
+
 class ModelExtraA(ShowFieldTypeAndContent, PolymorphicModel):
     field1 = models.CharField(max_length=10)
+
+
 class ModelExtraB(ModelExtraA):
     field2 = models.CharField(max_length=10)
+
+
 class ModelExtraC(ModelExtraB):
     field3 = models.CharField(max_length=10)
+
+
 class ModelExtraExternal(models.Model):
     topic = models.CharField(max_length=10)
 
-class ModelShow1(ShowFieldType,PolymorphicModel):
+
+class ModelShow1(ShowFieldType, PolymorphicModel):
     field1 = models.CharField(max_length=10)
     m2m = models.ManyToManyField('self')
+
+
 class ModelShow2(ShowFieldContent, PolymorphicModel):
     field1 = models.CharField(max_length=10)
     m2m = models.ManyToManyField('self')
+
+
 class ModelShow3(ShowFieldTypeAndContent, PolymorphicModel):
     field1 = models.CharField(max_length=10)
     m2m = models.ManyToManyField('self')
 
+
 class ModelShow1_plain(PolymorphicModel):
     field1 = models.CharField(max_length=10)
+
+
 class ModelShow2_plain(ModelShow1_plain):
     field2 = models.CharField(max_length=10)
 
 
 class Base(ShowFieldType, PolymorphicModel):
     field_b = models.CharField(max_length=10)
+
+
 class ModelX(Base):
     field_x = models.CharField(max_length=10)
+
+
 class ModelY(Base):
     field_y = models.CharField(max_length=10)
 
+
 class Enhance_Plain(models.Model):
     field_p = models.CharField(max_length=10)
+
+
 class Enhance_Base(ShowFieldTypeAndContent, PolymorphicModel):
     base_id = models.AutoField(primary_key=True)
     field_b = models.CharField(max_length=10)
+
+
 class Enhance_Inherit(Enhance_Base, Enhance_Plain):
     field_i = models.CharField(max_length=10)
 
+
 class RelationBase(ShowFieldTypeAndContent, PolymorphicModel):
     field_base = models.CharField(max_length=10)
     fk = models.ForeignKey('self', null=True, related_name='relationbase_set')
     m2m = models.ManyToManyField('self')
+
+
 class RelationA(RelationBase):
     field_a = models.CharField(max_length=10)
+
+
 class RelationB(RelationBase):
     field_b = models.CharField(max_length=10)
+
+
 class RelationBC(RelationB):
     field_c = models.CharField(max_length=10)
 
+
 class RelatingModel(models.Model):
     many2many = models.ManyToManyField(Model2A)
 
+
 class One2OneRelatingModel(PolymorphicModel):
     one2one = models.OneToOneField(Model2A)
     field1 = models.CharField(max_length=10)
 
+
 class One2OneRelatingModelDerived(One2OneRelatingModel):
     field2 = models.CharField(max_length=10)
 
+
 class MyManagerQuerySet(PolymorphicQuerySet):
+
     def my_queryset_foo(self):
         return self.all()  # Just a method to prove the existance of the custom queryset.
 
+
 class MyManager(PolymorphicManager):
     queryset_class = MyManagerQuerySet
 
@@ -120,27 +168,38 @@ class MyManager(PolymorphicManager):
     # Django <= 1.5 compatibility
     get_query_set = get_queryset
 
+
 class ModelWithMyManager(ShowFieldTypeAndContent, Model2A):
     objects = MyManager()
     field4 = models.CharField(max_length=10)
 
-if django.VERSION >= (1,7):
+if django.VERSION >= (1, 7):
     class ModelWithMyManager2(ShowFieldTypeAndContent, Model2A):
         objects = MyManagerQuerySet.as_manager()
         field4 = models.CharField(max_length=10)
 
+
 class MROBase1(ShowFieldType, PolymorphicModel):
     objects = MyManager()
     field1 = models.CharField(max_length=10)  # needed as MyManager uses it
+
+
 class MROBase2(MROBase1):
     pass  # Django vanilla inheritance does not inherit MyManager as _default_manager here
+
+
 class MROBase3(models.Model):
     objects = PolymorphicManager()
+
+
 class MRODerived(MROBase2, MROBase3):
     pass
 
+
 class ParentModelWithManager(PolymorphicModel):
     pass
+
+
 class ChildModelWithManager(PolymorphicModel):
     # Also test whether foreign keys receive the manager:
     fk = models.ForeignKey(ParentModelWithManager, related_name='childmodel_set')
@@ -148,10 +207,13 @@ class ChildModelWithManager(PolymorphicModel):
 
 
 class PlainMyManagerQuerySet(QuerySet):
+
     def my_queryset_foo(self):
         return self.all()  # Just a method to prove the existance of the custom queryset.
 
+
 class PlainMyManager(models.Manager):
+
     def my_queryset_foo(self):
         return self.get_queryset().my_queryset_foo()
 
@@ -161,9 +223,11 @@ class PlainMyManager(models.Manager):
     # Django <= 1.5 compatibility
     get_query_set = get_queryset
 
+
 class PlainParentModelWithManager(models.Model):
     pass
 
+
 class PlainChildModelWithManager(models.Model):
     fk = models.ForeignKey(PlainParentModelWithManager, related_name='childmodel_set')
     objects = PlainMyManager()
@@ -173,82 +237,132 @@ class MgrInheritA(models.Model):
     mgrA = models.Manager()
     mgrA2 = models.Manager()
     field1 = models.CharField(max_length=10)
+
+
 class MgrInheritB(MgrInheritA):
     mgrB = models.Manager()
     field2 = models.CharField(max_length=10)
+
+
 class MgrInheritC(ShowFieldTypeAndContent, MgrInheritB):
     pass
 
+
 class BlogBase(ShowFieldTypeAndContent, PolymorphicModel):
     name = models.CharField(max_length=10)
+
+
 class BlogA(BlogBase):
     info = models.CharField(max_length=10)
+
+
 class BlogB(BlogBase):
     pass
+
+
 class BlogEntry(ShowFieldTypeAndContent, PolymorphicModel):
     blog = models.ForeignKey(BlogA)
     text = models.CharField(max_length=10)
 
+
 class BlogEntry_limit_choices_to(ShowFieldTypeAndContent, PolymorphicModel):
     blog = models.ForeignKey(BlogBase)
     text = models.CharField(max_length=10)
 
+
 class ModelFieldNameTest(ShowFieldType, PolymorphicModel):
     modelfieldnametest = models.CharField(max_length=10)
 
+
 class InitTestModel(ShowFieldType, PolymorphicModel):
     bar = models.CharField(max_length=100)
+
     def __init__(self, *args, **kwargs):
         kwargs['bar'] = self.x()
         super(InitTestModel, self).__init__(*args, **kwargs)
+
+
 class InitTestModelSubclass(InitTestModel):
+
     def x(self):
         return 'XYZ'
 
 # models from github issue
+
+
 class Top(PolymorphicModel):
     name = models.CharField(max_length=50)
+
     class Meta:
         ordering = ('pk',)
+
+
 class Middle(Top):
     description = models.TextField()
+
+
 class Bottom(Middle):
     author = models.CharField(max_length=50)
 
+
 class UUIDProject(ShowFieldTypeAndContent, PolymorphicModel):
-     uuid_primary_key = UUIDField(primary_key = True, default=uuid.uuid1)
+    uuid_primary_key = UUIDField(primary_key=True, default=uuid.uuid1)
-     topic = models.CharField(max_length = 30)
+    topic = models.CharField(max_length=30)
+
+
 class UUIDArtProject(UUIDProject):
-     artist = models.CharField(max_length = 30)
+    artist = models.CharField(max_length=30)
+
+
 class UUIDResearchProject(UUIDProject):
-     supervisor = models.CharField(max_length = 30)
+    supervisor = models.CharField(max_length=30)
+
 
 class UUIDPlainA(models.Model):
-    uuid_primary_key = UUIDField(primary_key = True, default=uuid.uuid1)
+    uuid_primary_key = UUIDField(primary_key=True, default=uuid.uuid1)
     field1 = models.CharField(max_length=10)
+
+
 class UUIDPlainB(UUIDPlainA):
     field2 = models.CharField(max_length=10)
+
+
 class UUIDPlainC(UUIDPlainB):
     field3 = models.CharField(max_length=10)
 
 # base -> proxy
+
+
 class ProxyBase(PolymorphicModel):
     some_data = models.CharField(max_length=128)
+
+
 class ProxyChild(ProxyBase):
+
     class Meta:
         proxy = True
 
+
 class NonProxyChild(ProxyBase):
-    name=models.CharField(max_length=10)
+    name = models.CharField(max_length=10)
 
 # base -> proxy -> real models
+
+
 class ProxiedBase(ShowFieldTypeAndContent, PolymorphicModel):
     name = models.CharField(max_length=10)
+
+
 class ProxyModelBase(ProxiedBase):
+
     class Meta:
         proxy = True
+
+
 class ProxyModelA(ProxyModelBase):
     field1 = models.CharField(max_length=10)
+
+
 class ProxyModelB(ProxyModelBase):
     field2 = models.CharField(max_length=10)
 
@@ -264,11 +378,16 @@ class RelatedNameClash(ShowFieldType, PolymorphicModel):
     ctype = models.ForeignKey(ContentType, null=True, editable=False)
 
 #class with a parent_link to superclass, and a related_name back to subclass
+
+
 class TestParentLinkAndRelatedName(ModelShow1_plain):
     superclass = models.OneToOneField(ModelShow1_plain, parent_link=True, related_name='related_name_subclass')
 
+
 class CustomPkBase(ShowFieldTypeAndContent, PolymorphicModel):
     b = models.CharField(max_length=1)
+
+
 class CustomPkInherit(CustomPkBase):
     custom_id = models.AutoField(primary_key=True)
     i = models.CharField(max_length=1)
@@ -323,7 +442,7 @@ class PolymorphicTests(TestCase):
 
         # test ordering for field in one subclass only
         # MySQL and SQLite return this order
-        expected1='''
+        expected1 = '''
 [ <BlogA: id 8, name (CharField) "B5", info (CharField) "i5">,
   <BlogA: id 7, name (CharField) "B4", info (CharField) "i4">,
   <BlogA: id 6, name (CharField) "B3", info (CharField) "i3">,
@@ -334,7 +453,7 @@ class PolymorphicTests(TestCase):
   <BlogB: id 4, name (CharField) "Bb3"> ]'''
 
         # PostgreSQL returns this order
-        expected2='''
+        expected2 = '''
 [ <BlogB: id 2, name (CharField) "Bb1">,
   <BlogB: id 3, name (CharField) "Bb2">,
   <BlogB: id 4, name (CharField) "Bb3">,
@@ -347,7 +466,6 @@ class PolymorphicTests(TestCase):
         x = '\n' + repr(BlogBase.objects.order_by('-BlogA___info'))
         self.assertTrue(x == expected1 or x == expected2)
 
-
     def test_limit_choices_to(self):
         """
         this is not really a testcase, as limit_choices_to only affects the Django admin
@@ -359,7 +477,6 @@ class PolymorphicTests(TestCase):
         entry1 = BlogEntry_limit_choices_to.objects.create(blog=blog_b, text='bla2')
         entry2 = BlogEntry_limit_choices_to.objects.create(blog=blog_b, text='bla2')
 
-
     def test_primary_key_custom_field_problem(self):
         """
         object retrieval problem occuring with some custom primary key fields (UUIDField as test case)
@@ -377,7 +494,7 @@ class PolymorphicTests(TestCase):
         self.assertIsInstance(a.uuid_primary_key, uuid.UUID)
         self.assertIsInstance(a.pk, uuid.UUID)
 
-        res = re.sub(' "(.*?)..", topic',', topic', repr(qs))
+        res = re.sub(' "(.*?)..", topic', ', topic', repr(qs))
         res_exp = """[ <UUIDProject: uuid_primary_key (UUIDField/pk), topic (CharField) "John's gathering">,
   <UUIDArtProject: uuid_primary_key (UUIDField/pk), topic (CharField) "Sculpting with Tim", artist (CharField) "T. Turner">,
   <UUIDResearchProject: uuid_primary_key (UUIDField/pk), topic (CharField) "Swallow Aerodynamics", supervisor (CharField) "Dr. Winter"> ]"""
@@ -401,7 +518,6 @@ class PolymorphicTests(TestCase):
         Model2C.objects.create(field1='C1', field2='C2', field3='C3')
         Model2D.objects.create(field1='D1', field2='D2', field3='D3', field4='D4')
 
-
     def test_simple_inheritance(self):
         self.create_model2abcd()
 
@@ -411,14 +527,12 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[2]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
         self.assertEqual(repr(objects[3]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
 
-
     def test_manual_get_real_instance(self):
         self.create_model2abcd()
 
         o = Model2A.objects.non_polymorphic().get(field1='C1')
         self.assertEqual(repr(o.get_real_instance()), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
 
-
     def test_non_polymorphic(self):
         self.create_model2abcd()
 
@@ -428,7 +542,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[2]), '<Model2A: id 3, field1 (CharField)>')
         self.assertEqual(repr(objects[3]), '<Model2A: id 4, field1 (CharField)>')
 
-
     def test_get_real_instances(self):
         self.create_model2abcd()
         qs = Model2A.objects.all().non_polymorphic()
@@ -447,7 +560,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[2]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
         self.assertEqual(repr(objects[3]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
 
-
     def test_translate_polymorphic_q_object(self):
         self.create_model2abcd()
 
@@ -456,7 +568,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[0]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
         self.assertEqual(repr(objects[1]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
 
-
     def test_base_manager(self):
         def show_base_manager(model):
             return "{0} {1}".format(
@@ -475,7 +586,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(show_base_manager(One2OneRelatingModel), "<class 'polymorphic.manager.PolymorphicManager'> <class 'polymorphic.tests.One2OneRelatingModel'>")
         self.assertEqual(show_base_manager(One2OneRelatingModelDerived), "<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.One2OneRelatingModelDerived'>")
 
-
     def test_instance_default_manager(self):
         def show_default_manager(instance):
             return "{0} {1}".format(
@@ -508,7 +618,6 @@ class PolymorphicTests(TestCase):
         object2b = Model2B.base_objects.get(field1='C1')
         self.assertEqual(repr(object2b.model2c), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
 
-
     def test_onetoone_field(self):
         self.create_model2abcd()
 
@@ -522,7 +631,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(c.one2one), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
         self.assertEqual(repr(a.one2onerelatingmodel), '<One2OneRelatingModelDerived: One2OneRelatingModelDerived object>')
 
-
     def test_manytomany_field(self):
         # Model 1
         o = ModelShow1.objects.create(field1='abc')
@@ -537,7 +645,7 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(ModelShow2.objects.all()), '[ <ModelShow2: id 1, field1 "abc", m2m 1> ]')
 
         # Model 3
-        o=ModelShow3.objects.create(field1='abc')
+        o = ModelShow3.objects.create(field1='abc')
         o.m2m.add(o)
         o.save()
         self.assertEqual(repr(ModelShow3.objects.all()), '[ <ModelShow3: id 1, field1 (CharField) "abc", m2m (ManyToManyField) 1> ]')
@@ -550,7 +658,6 @@ class PolymorphicTests(TestCase):
         ModelShow2_plain.objects.create(field1='abc', field2='def')
         self.assertEqual(repr(ModelShow1_plain.objects.all()), '[<ModelShow1_plain: ModelShow1_plain object>, <ModelShow2_plain: ModelShow2_plain object>]')
 
-
     def test_extra_method(self):
         self.create_model2abcd()
 
@@ -569,7 +676,7 @@ class PolymorphicTests(TestCase):
         ModelExtraExternal.objects.create(topic='extra1')
         ModelExtraExternal.objects.create(topic='extra2')
         ModelExtraExternal.objects.create(topic='extra3')
-        objects = ModelExtraA.objects.extra(tables=["polymorphic_modelextraexternal"], select={"topic":"polymorphic_modelextraexternal.topic"}, where=["polymorphic_modelextraa.id = polymorphic_modelextraexternal.id"])
+        objects = ModelExtraA.objects.extra(tables=["polymorphic_modelextraexternal"], select={"topic": "polymorphic_modelextraexternal.topic"}, where=["polymorphic_modelextraa.id = polymorphic_modelextraexternal.id"])
         if six.PY3:
             self.assertEqual(repr(objects[0]), '<ModelExtraA: id 1, field1 (CharField) "A1" - Extra: topic (str) "extra1">')
             self.assertEqual(repr(objects[1]), '<ModelExtraB: id 2, field1 (CharField) "B1", field2 (CharField) "B2" - Extra: topic (str) "extra2">')
@@ -580,7 +687,6 @@ class PolymorphicTests(TestCase):
             self.assertEqual(repr(objects[2]), '<ModelExtraC: id 3, field1 (CharField) "C1", field2 (CharField) "C2", field3 (CharField) "C3" - Extra: topic (unicode) "extra3">')
         self.assertEqual(len(objects), 3)
 
-
     def test_instance_of_filter(self):
         self.create_model2abcd()
 
@@ -606,16 +712,14 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
         self.assertEqual(len(objects), 1)
 
-
     def test_polymorphic___filter(self):
         self.create_model2abcd()
 
-        objects = Model2A.objects.filter(Q( Model2B___field2='B2') | Q( Model2C___field3='C3'))
+        objects = Model2A.objects.filter(Q(Model2B___field2='B2') | Q(Model2C___field3='C3'))
         self.assertEqual(len(objects), 2)
         self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
         self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
 
-
     def test_delete(self):
         self.create_model2abcd()
 
@@ -630,7 +734,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[2]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
         self.assertEqual(len(objects), 3)
 
-
     def test_combine_querysets(self):
         ModelX.objects.create(field_x='x')
         ModelY.objects.create(field_y='y')
@@ -640,7 +743,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(qs[1]), '<ModelY: id 2, field_b (CharField), field_y (CharField)>')
         self.assertEqual(len(qs), 2)
 
-
     def test_multiple_inheritance(self):
         # multiple inheritance, subclassing third party models (mix PolymorphicModel with models.Model)
 
@@ -685,7 +787,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(repr(objects[1]), '<RelationB: id 3, field_base (CharField) "B1", fk (ForeignKey) RelationA, field_b (CharField) "B2", m2m (ManyToManyField) 1>')
         self.assertEqual(len(objects), 2)
 
-
     def test_user_defined_manager(self):
         self.create_model2abcd()
         ModelWithMyManager.objects.create(field1='D1a', field4='D4a')
@@ -700,7 +801,7 @@ class PolymorphicTests(TestCase):
         self.assertIs(type(ModelWithMyManager._default_manager), MyManager)
         self.assertIs(type(ModelWithMyManager.base_objects), models.Manager)
 
-    @skipIf(django.VERSION < (1,7), "This test needs Django 1.7+")
+    @skipIf(django.VERSION < (1, 7), "This test needs Django 1.7+")
     def test_user_defined_queryset_as_manager(self):
         self.create_model2abcd()
         ModelWithMyManager2.objects.create(field1='D1a', field4='D4a')
@@ -715,7 +816,6 @@ class PolymorphicTests(TestCase):
         self.assertEqual(type(ModelWithMyManager2._default_manager).__name__, 'PolymorphicManagerFromMyManagerQuerySet')
         self.assertIs(type(ModelWithMyManager2.base_objects), models.Manager)
 
-
     def test_manager_inheritance(self):
         # by choice of MRO, should be MyManager from MROBase1.
         self.assertIs(type(MRODerived.objects), MyManager)
@@ -726,7 +826,6 @@ class PolymorphicTests(TestCase):
         # Django vanilla inheritance does not inherit MyManager as _default_manager here
         self.assertIs(type(MROBase2._default_manager), MyManager)
 
-
     def test_queryset_assignment(self):
         # This is just a consistency check for now, testing standard Django behavior.
         parent = PlainParentModelWithManager.objects.create()
@@ -750,7 +849,6 @@ class PolymorphicTests(TestCase):
         # A related set is created using the model's _default_manager, so does gain extra methods.
         self.assertIs(type(parent.childmodel_set.my_queryset_foo()), MyManagerQuerySet)
 
-
     def test_proxy_models(self):
         # prepare some data
         for data in ('bleep bloop', 'I am a', 'computer'):
@@ -771,7 +869,7 @@ class PolymorphicTests(TestCase):
         This unit test guards that this check is working properly. For instance,
         proxy child models need to be handled separately.
         """
-        name="Item1"
+        name = "Item1"
         nonproxychild = NonProxyChild.objects.create(name=name)
 
         pb = ProxyBase.objects.get(id=1)
@@ -792,7 +890,6 @@ class PolymorphicTests(TestCase):
         ct = ContentType.objects.get_for_model(ProxyChild, for_concrete_model=False)
         self.assertEqual(ProxyChild, ct.model_class())
 
-
     def test_proxy_model_inheritance(self):
         """
         Polymorphic abilities should also work when the base model is a proxy object.
@@ -852,7 +949,7 @@ class PolymorphicTests(TestCase):
 
         #check that the accessors to parent and sublass work correctly and return the right object
         p = ModelShow1_plain.objects.non_polymorphic().get(field1="TestParentLinkAndRelatedName")
-        self.assertNotEqual(p, t) #p should be Plain1 and t TestParentLinkAndRelatedName, so not equal
+        self.assertNotEqual(p, t)  # p should be Plain1 and t TestParentLinkAndRelatedName, so not equal
         self.assertEqual(p, t.superclass)
         self.assertEqual(p.related_name_subclass, t)
 
@@ -860,7 +957,6 @@ class PolymorphicTests(TestCase):
         t.delete()
 
 
-
 class RegressionTests(TestCase):
 
     def test_for_query_result_incomplete_with_inheritance(self):
@@ -881,4 +977,3 @@ class RegressionTests(TestCase):
 
         expected_queryset = [bottom]
         self.assertQuerysetEqual(Bottom.objects.all(), [repr(r) for r in expected_queryset])
-