serenajiang commented on a change in pull request #9943:
URL: 
https://github.com/apache/incubator-superset/pull/9943#discussion_r434058182



##########
File path: superset/app.py
##########
@@ -109,8 +111,8 @@ class AppContextTask(task_base):  # type: ignore
             abstract = True
 
             # Grab each call into the task and set up an app context
-            def __call__(self, *args, **kwargs):
-                with flask_app.app_context():
+            def __call__(self, *args: Any, **kwargs: Any) -> Any:
+                with flask_app.app_context():  # type: ignore

Review comment:
       This probably is for later, we should look into using the [flask stubs 
in 
typeshed](https://github.com/python/typeshed/tree/master/third_party/2and3/flask)

##########
File path: superset/viz.py
##########
@@ -2866,12 +2903,20 @@ def nest_values(self, levels, level=0, metric=None, 
dims=()):
             {
                 "name": i,
                 "val": levels[level][metric][dims][i],
-                "children": self.nest_values(levels, level + 1, metric, dims + 
(i,)),
+                "children": self.nest_values(levels, level + 1, metric, dims + 
[i]),
             }
             for i in levels[level][metric][dims].index
         ]
 
-    def nest_procs(self, procs, level=-1, dims=(), time=None):
+    def nest_procs(
+        self,
+        procs: Dict[int, pd.DataFrame],
+        level: int = -1,
+        dims: Optional[Tuple[str, ...]] = None,
+        time: Optional[Any] = None,

Review comment:
       ```suggestion
           time: Any = None,
   ```

##########
File path: superset/viz.py
##########
@@ -559,7 +563,7 @@ class TableViz(BaseViz):
     is_timeseries = False
     enforce_numerical_metrics = False
 
-    def should_be_timeseries(self):
+    def should_be_timeseries(self) -> Optional[bool]:

Review comment:
       In this case, if `should_be_timeseries()` is `None`, does that mean this 
is `False`? It could be good to cast the results to `bool` to avoid the weird 
sorts of results that occur with short circuiting + `.get`. Then, we can 
replace most of the `Optional[bool]` types with `bool`.




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