diff --git a/airflow/www/views.py b/airflow/www/views.py
index cdee2b9aa5cb0..e7eeb3c629b7f 100644
--- a/airflow/www/views.py
+++ b/airflow/www/views.py
@@ -2310,16 +2310,10 @@ def duration(self, session=None):
             dag = dag.partial_subset(task_ids_or_regex=root, include_upstream=True, include_downstream=False)
         chart_height = wwwutils.get_chart_height(dag)
         chart = nvd3.lineChart(
-            name="lineChart",
-            x_is_date=True,
-            height=chart_height,
-            chart_attr=self.line_chart_attr
+            name="lineChart", x_is_date=True, height=chart_height, chart_attr=self.line_chart_attr
         )
         cum_chart = nvd3.lineChart(
-            name="cumLineChart",
-            x_is_date=True,
-            height=chart_height,
-            chart_attr=self.line_chart_attr
+            name="cumLineChart", x_is_date=True, height=chart_height, chart_attr=self.line_chart_attr
         )
 
         y_points = defaultdict(list)
@@ -2443,7 +2437,7 @@ def tries(self, session=None):
             x_is_date=True,
             y_axis_format='d',
             height=chart_height,
-            chart_attr=self.line_chart_attr
+            chart_attr=self.line_chart_attr,
         )
 
         for task in dag.tasks:
@@ -2514,10 +2508,7 @@ def landing_times(self, session=None):
 
         chart_height = wwwutils.get_chart_height(dag)
         chart = nvd3.lineChart(
-            name="lineChart",
-            x_is_date=True,
-            height=chart_height,
-            chart_attr=self.line_chart_attr
+            name="lineChart", x_is_date=True, height=chart_height, chart_attr=self.line_chart_attr
         )
         y_points = {}
         x_points = {}