Fixed non-removed code from django filters and some PEP8 errors

Author: syrusakbary

graphene/contrib/django/filter/__init__.py

@@ -8,8 +8,6 @@
 
 from .fields import DjangoFilterConnectionField
 from .filterset import GrapheneFilterSet, GlobalIDFilter, GlobalIDMultipleChoiceFilter
-from .resolvers import FilterConnectionResolver
 
 __all__ = ['DjangoFilterConnectionField', 'GrapheneFilterSet',
-           'GlobalIDFilter', 'GlobalIDMultipleChoiceFilter',
-           'FilterConnectionResolver']
+           'GlobalIDFilter', 'GlobalIDMultipleChoiceFilter']

graphene/contrib/django/filter/tests/test_fields.py

@@ -185,8 +185,8 @@ class Query(ObjectType):
 
     r1 = Reporter.objects.create(first_name='r1', last_name='r1', email='[email protected]')
     r2 = Reporter.objects.create(first_name='r2', last_name='r2', email='[email protected]')
-    a1 = Article.objects.create(headline='a1', pub_date=datetime.now(), reporter=r1)
-    a2 = Article.objects.create(headline='a2', pub_date=datetime.now(), reporter=r2)
+    Article.objects.create(headline='a1', pub_date=datetime.now(), reporter=r1)
+    Article.objects.create(headline='a2', pub_date=datetime.now(), reporter=r2)
 
     query = '''
     query {

graphene/contrib/django/tests/test_resolvers.py

@@ -1,5 +1,5 @@
 [flake8]
-exclude = setup.py,docs/*
+exclude = setup.py,docs/*,examples/cookbook_django/*
 max-line-length = 120
 
 [coverage:run]