[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

test/test_observer.py

@@ -38,7 +38,7 @@ def test_state_changes():
         smartcard.Observer.Observable.clearChanged,
         smartcard.Observer.Observable.hasChanged,
         smartcard.Observer.Observable.setChanged,
-    )
+    ),
 )
 def test_synchronization(unbound_method):
     """Verify that all Observable methods are synchronized.
@@ -78,7 +78,7 @@ class JealousObserver(smartcard.Observer.Observer):
 
         def update(self, observable, _):
             # Try to prevent all other observers from receiving an update.
-            for other_observer in (observers - {self}):
+            for other_observer in observers - {self}:
                 try:
                     observable.deleteObserver(other_observer)
                 except ValueError: