Fixing the build's linting errors (#3887)

master has new linting rules, PRs got merged with lint that was ok at
branching but not ok in masert anymore

superset/cli.py

@@ -133,14 +133,14 @@ def load_examples(load_test_data):
     print('Loading [Misc Charts] dashboard')
     data.load_misc_dashboard()
 
-    print("Loading DECK.gl demo")
+    print('Loading DECK.gl demo')
     data.load_deck_dash()
 
     if load_test_data:
         print('Loading [Unicode test data]')
         data.load_unicode_test_data()
 
-    print("Loading flights data")
+    print('Loading flights data')
     data.load_flights()
 
 

superset/viz.py

@@ -1769,17 +1769,17 @@ def get_data(self, df):
             d = dict(position=self.get_position(d), **self.get_properties(d))
             features.append(d)
         return {
-            "features": features,
-            "mapboxApiKey": config.get('MAPBOX_API_KEY'),
+            'features': features,
+            'mapboxApiKey': config.get('MAPBOX_API_KEY'),
         }
 
 
 class DeckScatterViz(BaseDeckGLViz):
 
     """deck.gl's ScatterLayer"""
 
-    viz_type = "deck_scatter"
-    verbose_name = _("Deck.gl - Scatter plot")
+    viz_type = 'deck_scatter'
+    verbose_name = _('Deck.gl - Scatter plot')
 
     def query_obj(self):
         self.point_radius_fixed = self.form_data.get('point_radius_fixed')
@@ -1794,8 +1794,8 @@ def get_metrics(self):
 
     def get_properties(self, d):
         return {
-            "radius": self.fixed_value if self.fixed_value else d.get(self.metric),
-            "cat_color": d.get(self.dim) if self.dim else None,
+            'radius': self.fixed_value if self.fixed_value else d.get(self.metric),
+            'cat_color': d.get(self.dim) if self.dim else None,
         }
 
     def get_data(self, df):
@@ -1813,24 +1813,24 @@ class DeckScreengrid(BaseDeckGLViz):
 
     """deck.gl's ScreenGridLayer"""
 
-    viz_type = "deck_screengrid"
-    verbose_name = _("Deck.gl - Screen Grid")
+    viz_type = 'deck_screengrid'
+    verbose_name = _('Deck.gl - Screen Grid')
 
 
 class DeckGrid(BaseDeckGLViz):
 
     """deck.gl's DeckLayer"""
 
-    viz_type = "deck_grid"
-    verbose_name = _("Deck.gl - 3D Grid")
+    viz_type = 'deck_grid'
+    verbose_name = _('Deck.gl - 3D Grid')
 
 
 class DeckHex(BaseDeckGLViz):
 
     """deck.gl's DeckLayer"""
 
-    viz_type = "deck_hex"
-    verbose_name = _("Deck.gl - 3D HEX")
+    viz_type = 'deck_hex'
+    verbose_name = _('Deck.gl - 3D HEX')
 
 
 class EventFlowViz(BaseViz):