john-bodley commented on a change in pull request #9138: [mypy] Enforcing 
typing for db_engine_specs
URL: 
https://github.com/apache/incubator-superset/pull/9138#discussion_r379568840
 
 

 ##########
 File path: superset/db_engine_specs/base.py
 ##########
 @@ -132,7 +138,9 @@ def get_allow_cost_estimate(cls, version: str = None) -> 
bool:
         return False
 
     @classmethod
-    def get_engine(cls, database, schema=None, source=None):
+    def get_engine(
+        cls, database: Database, schema: str = None, source: str = None
 
 Review comment:
   Agreed. I'm currently unsure why Mypy isn't enforcing that per 
[here](https://mypy.readthedocs.io/en/stable/command_line.html#cmdoption-mypy-no-implicit-optional).

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