typing: Avoid scoped redefinition of different types.

Mypy doesn't allow redefinition of a variable using a different type
within the same scope.
python/mypy#1174

Author: PIG208

corporate/tests/test_stripe.py

@@ -487,9 +487,9 @@ def raise_invalid_request_error() -> None:
             raise stripe.error.InvalidRequestError("message", "param", "code", json_body={})
 
         with self.assertLogs("corporate.stripe", "ERROR") as error_log:
-            with self.assertRaises(BillingError) as context:
+            with self.assertRaises(BillingError) as billing_context:
                 raise_invalid_request_error()
-            self.assertEqual("other stripe error", context.exception.error_description)
+            self.assertEqual("other stripe error", billing_context.exception.error_description)
             self.assertEqual(
                 error_log.output, ["ERROR:corporate.stripe:Stripe error: None None None None"]
             )
@@ -503,10 +503,10 @@ def raise_card_error() -> None:
             )
 
         with self.assertLogs("corporate.stripe", "INFO") as info_log:
-            with self.assertRaises(StripeCardError) as context:
+            with self.assertRaises(StripeCardError) as card_context:
                 raise_card_error()
-            self.assertIn("not a valid credit card", str(context.exception))
-            self.assertEqual("card error", context.exception.error_description)
+            self.assertIn("not a valid credit card", str(card_context.exception))
+            self.assertEqual("card error", card_context.exception.error_description)
             self.assertEqual(
                 info_log.output, ["INFO:corporate.stripe:Stripe card error: None None None None"]
             )

zerver/tests/test_decorators.py

@@ -179,14 +179,16 @@ def get_total(
         self.assertEqual(str(cm.exception), "Bad value for 'numbers': bad_value")
 
         request.POST["numbers"] = orjson.dumps("{fun: unfun}").decode()
-        with self.assertRaises(JsonableError) as cm:
+        with self.assertRaises(JsonableError) as jsonable_error_cm:
             get_total(request)
-        self.assertEqual(str(cm.exception), "Bad value for 'numbers': \"{fun: unfun}\"")
+        self.assertEqual(
+            str(jsonable_error_cm.exception), "Bad value for 'numbers': \"{fun: unfun}\""
+        )
 
         request.POST["numbers"] = orjson.dumps([2, 3, 5, 8, 13, 21]).decode()
-        with self.assertRaises(JsonableError) as cm:
+        with self.assertRaises(JsonableError) as jsonable_error_cm:
             get_total(request)
-        self.assertEqual(str(cm.exception), "13 is an unlucky number!")
+        self.assertEqual(str(jsonable_error_cm.exception), "13 is an unlucky number!")
 
         request.POST["numbers"] = orjson.dumps([1, 2, 3, 4, 5, 6]).decode()
         result = get_total(request)

zerver/tests/test_users.py

@@ -295,7 +295,7 @@ def test_admin_api_hide_emails(self) -> None:
             "zerver.lib.events.request_event_queue", return_value=None
         ) as mock_request_event_queue:
             with self.assertRaises(JsonableError):
-                result = do_events_register(user, get_client("website"), client_gravatar=True)
+                do_events_register(user, get_client("website"), client_gravatar=True)
             self.assertEqual(mock_request_event_queue.call_args_list[0][0][3], True)
 
         #############################################################