diff --git a/superset/connectors/druid/views.py b/superset/connectors/druid/views.py
index fcd4adbd77ac2..d73331bc5e8c3 100644
--- a/superset/connectors/druid/views.py
+++ b/superset/connectors/druid/views.py
@@ -185,7 +185,8 @@ def _delete(self, pk):
     icon='fa-cubes',
     category='Sources',
     category_label=__('Sources'),
-    category_icon='fa-database',)
+    category_icon='fa-database',
+)
 
 
 class DruidDatasourceModelView(DatasourceModelView, DeleteMixin, YamlExportMixin):  # noqa
@@ -348,4 +349,4 @@ def scan_new_datasources(self):
     icon='fa-cog')
 
 
-appbuilder.add_separator('Sources', )
+appbuilder.add_separator('Sources')
diff --git a/superset/connectors/sqla/models.py b/superset/connectors/sqla/models.py
index 18803c565b76f..e13a8dfd4a0b6 100644
--- a/superset/connectors/sqla/models.py
+++ b/superset/connectors/sqla/models.py
@@ -349,8 +349,7 @@ def values_for_column(self, column_name, limit=10000):
 
         engine = self.database.get_sqla_engine()
         sql = '{}'.format(
-            qry.compile(
-                engine, compile_kwargs={'literal_binds': True}, ),
+            qry.compile(engine, compile_kwargs={'literal_binds': True}),
         )
 
         df = pd.read_sql_query(sql=sql, con=engine)
diff --git a/superset/connectors/sqla/views.py b/superset/connectors/sqla/views.py
index 12f9d6d555617..f4abf12f980c7 100644
--- a/superset/connectors/sqla/views.py
+++ b/superset/connectors/sqla/views.py
@@ -294,6 +294,7 @@ def refresh(self, tables):
     label=__('Tables'),
     category='Sources',
     category_label=__('Sources'),
-    icon='fa-table',)
+    icon='fa-table',
+)
 
 appbuilder.add_separator('Sources')
diff --git a/superset/sql_lab.py b/superset/sql_lab.py
index d7b0878011598..63225f3e2d058 100644
--- a/superset/sql_lab.py
+++ b/superset/sql_lab.py
@@ -240,7 +240,7 @@ def handle_error(msg):
                 limit=query.limit,
                 schema=database.force_ctas_schema,
                 show_cols=False,
-                latest_partition=False, ))
+                latest_partition=False))
     query.end_time = utils.now_as_float()
     session.merge(query)
     session.flush()
diff --git a/superset/views/core.py b/superset/views/core.py
index 802fda9ef3705..2f0c0e5c2499a 100755
--- a/superset/views/core.py
+++ b/superset/views/core.py
@@ -187,7 +187,7 @@ class DatabaseView(SupersetModelView, DeleteMixin, YamlExportMixin):  # noqa
         'allow_ctas', 'allow_dml', 'force_ctas_schema', 'impersonate_user']
     search_exclude_columns = (
         'password', 'tables', 'created_by', 'changed_by', 'queries',
-        'saved_queries', )
+        'saved_queries')
     edit_columns = add_columns
     show_columns = [
         'tables',
@@ -281,7 +281,7 @@ def _delete(self, pk):
     icon='fa-cloud-upload',
     category='Manage',
     category_label=__('Manage'),
-    category_icon='fa-wrench',)
+    category_icon='fa-wrench')
 
 
 appbuilder.add_view(
@@ -291,7 +291,7 @@ def _delete(self, pk):
     icon='fa-database',
     category='Sources',
     category_label=__('Sources'),
-    category_icon='fa-database',)
+    category_icon='fa-database')
 
 
 class DatabaseAsync(DatabaseView):
@@ -400,7 +400,7 @@ class AccessRequestsModelView(SupersetModelView, DeleteMixin):
     label=__('Access requests'),
     category='Security',
     category_label=__('Security'),
-    icon='fa-table',)
+    icon='fa-table')
 
 
 class SliceModelView(SupersetModelView, DeleteMixin):  # noqa
@@ -488,7 +488,7 @@ def add(self):
     label=__('Charts'),
     icon='fa-bar-chart',
     category='',
-    category_icon='',)
+    category_icon='')
 
 
 class SliceAsync(SliceModelView):  # noqa
@@ -615,7 +615,7 @@ def download_dashboards(self):
     label=__('Dashboards'),
     icon='fa-dashboard',
     category='',
-    category_icon='',)
+    category_icon='')
 
 
 class DashboardModelViewAsync(DashboardModelView):  # noqa
@@ -2594,7 +2594,7 @@ class CssTemplateAsyncModelView(CssTemplateModelView):
     icon='fa-upload',
     category='Sources',
     category_label=__('Sources'),
-    category_icon='fa-wrench',)
+    category_icon='fa-wrench')
 appbuilder.add_separator('Sources')
 
 
diff --git a/tests/core_tests.py b/tests/core_tests.py
index bdc758502fc5a..2d73cf79618df 100644
--- a/tests/core_tests.py
+++ b/tests/core_tests.py
@@ -833,18 +833,20 @@ def test_import_csv(self):
 
     def test_dataframe_timezone(self):
         tz = psycopg2.tz.FixedOffsetTimezone(offset=60, name=None)
-        data = [(datetime.datetime(2017, 11, 18, 21, 53, 0, 219225, tzinfo=tz),),
-                (datetime.datetime(2017, 11, 18, 22, 6, 30, 61810, tzinfo=tz,),)]
+        data = [
+            (datetime.datetime(2017, 11, 18, 21, 53, 0, 219225, tzinfo=tz),),
+            (datetime.datetime(2017, 11, 18, 22, 6, 30, 61810, tzinfo=tz),),
+        ]
         df = dataframe.SupersetDataFrame(pd.DataFrame(data=list(data),
-                                                      columns=['data', ]))
+                                                      columns=['data']))
         data = df.data
         self.assertDictEqual(
             data[0],
-            {'data': pd.Timestamp('2017-11-18 21:53:00.219225+0100', tz=tz), },
+            {'data': pd.Timestamp('2017-11-18 21:53:00.219225+0100', tz=tz)},
         )
         self.assertDictEqual(
             data[1],
-            {'data': pd.Timestamp('2017-11-18 22:06:30.061810+0100', tz=tz), },
+            {'data': pd.Timestamp('2017-11-18 22:06:30.061810+0100', tz=tz)},
         )